diff --git a/archetype/config/main.js b/archetype/config/main.js
index e2c184f..69966cf 100644
--- a/archetype/config/main.js
+++ b/archetype/config/main.js
@@ -22,6 +22,13 @@ module.exports = {
     require('<%- trailpacks %>')
   ],
 
+  /**
+   * Override trailspacks configurations for modify based on custom requirements
+   */
+  packsConfig: {
+
+  },
+
   /**
    * Define application paths here. "root" is the only required path.
    */
diff --git a/lib/trails.js b/lib/trails.js
index 7982ad8..e25cd05 100644
--- a/lib/trails.js
+++ b/lib/trails.js
@@ -6,6 +6,32 @@ const lib = require('.')
 
 module.exports = {
 
+  /**
+   * Detect if the item is a Object.
+   */
+  isObject (item) {
+    return (item && typeof item === 'object' &&
+            !Array.isArray(item) && item !== null)
+  },
+
+  /**
+   * Deep Merge Objects
+   */
+  deepMerge (target, source) {
+    if (this.isObject(target) && this.isObject(source)) {
+      Object.keys(source).forEach(key => {
+        if (this.isObject(source[key])) {
+          if (!target[key]) Object.assign(target, { [key]: {} })
+          this.deepMerge(target[key], source[key])
+        }
+        else {
+          Object.assign(target, { [key]: source[key] })
+        }
+      })
+    }
+    return target
+  },
+
   /**
    * Copy and merge the provided configuration into a new object, decorated with
    * necessary default and environment-specific values.
@@ -15,6 +41,7 @@ module.exports = {
       main: {
         maxListeners: 128,
         packs: (config.main || { }).packs || [ ],
+        packsConfig: (config.main || { }).packsConfig || {},
         paths: {
           root: path.resolve(path.dirname(require.main.filename)),
           temp: path.resolve(path.dirname(require.main.filename), '.tmp')
@@ -26,23 +53,25 @@ module.exports = {
       },
       log: { }
     }
-    const envConfig = (config.env && config.env[process.env.NODE_ENV]) || { }
+
+    // merge config.env
+    config = this.deepMerge(
+        (config || { }),
+        ((config.env && config.env[process.env.NODE_ENV]) || { })
+    )
 
     // merge config.main.paths
     Object.assign(
-      configTemplate.main.paths, (config.main || { }).paths, (envConfig.main || { }).paths
+      configTemplate.main.paths, (config.main || { }).paths
     )
 
     // merge config.main.timeouts
     Object.assign(
-      configTemplate.main.timeouts, (config.main || { }).timeouts, (envConfig.main || { }).timeouts
+      configTemplate.main.timeouts, (config.main || { }).timeouts
     )
 
-    // override config.main.packs with env config
-    configTemplate.main.packs = (envConfig.main || { }).packs || (config.main || { }).packs || [ ]
-
     // merge application log
-    Object.assign(configTemplate.log, config.log, envConfig.log)
+    Object.assign(configTemplate.log, config.log)
 
     // merge remaining environment-specific config properties
     return Object.assign({ }, config, configTemplate)
diff --git a/test/lib/trails.test.js b/test/lib/trails.test.js
index b7d702a..7c6cc8e 100644
--- a/test/lib/trails.test.js
+++ b/test/lib/trails.test.js
@@ -18,6 +18,14 @@ describe('lib.Trails', () => {
             log: {
               merged: 'yes',
               extraneous: 'assigned'
+            },
+            customObject: {
+              string: 'b',
+              int: 2,
+              array: [2, 3, 4],
+              subobj: {
+                attr: 'b'
+              }
             }
           },
           envTest2: {
@@ -28,6 +36,12 @@ describe('lib.Trails', () => {
               },
               merged: 'yes',
               extraneous: 'assigned'
+            },
+            customObject: {
+              subobj: {
+                attr: 'b'
+              },
+              int2: 2
             }
           },
           envTest3: {
@@ -54,6 +68,14 @@ describe('lib.Trails', () => {
             }
           },
           normal: 'yes'
+        },
+        customObject: {
+          string: 'a',
+          int: 1,
+          array: [1, 2, 3],
+          subobj: {
+            attr: 'a'
+          }
         }
       }
     })
@@ -112,6 +134,49 @@ describe('lib.Trails', () => {
       assert.equal(config.main.maxListeners, 128)
     })
 
+    it('should merge full custom env config', () => {
+      process.env.NODE_ENV = 'envTest1'
+      const config = lib.Trails.buildConfig(testConfig)
+
+      assert(config)
+      assert(typeof config.customObject === 'object')
+      assert.equal(config.customObject.string, 'b')
+      assert.equal(config.customObject.int, 2)
+      assert(Array.isArray(config.customObject.array))
+      assert.equal(config.customObject.array[0], 2)
+      assert(typeof config.customObject.subobj === 'object')
+      assert.equal(config.customObject.subobj.attr, 'b')
+    })
+
+    it('should merge partial custom env config', () => {
+      process.env.NODE_ENV = 'envTest2'
+      const config = lib.Trails.buildConfig(testConfig)
+
+      assert(config)
+      assert(typeof config.customObject === 'object')
+      assert.equal(config.customObject.string, 'a')
+      assert.equal(config.customObject.int, 1)
+      assert(Array.isArray(config.customObject.array))
+      assert.equal(config.customObject.array[0], 1)
+      assert(typeof config.customObject.subobj === 'object')
+      assert.equal(config.customObject.subobj.attr, 'b')
+    })
+
+    it('should merge new custom attr in env config', () => {
+      process.env.NODE_ENV = 'envTest2'
+      const config = lib.Trails.buildConfig(testConfig)
+
+      assert(config)
+      assert(typeof config.customObject === 'object')
+      assert.equal(config.customObject.string, 'a')
+      assert.equal(config.customObject.int, 1)
+      assert(Array.isArray(config.customObject.array))
+      assert.equal(config.customObject.array[0], 1)
+      assert(typeof config.customObject.subobj === 'object')
+      assert.equal(config.customObject.subobj.attr, 'b')
+      assert.equal(config.customObject.int2, 2)
+    })
+
     it('should not override any configs if NODE_ENV matches no env', () => {
       process.env.NODE_ENV = 'notconfigured'
       const config = lib.Trails.buildConfig(testConfig)
@@ -119,6 +184,7 @@ describe('lib.Trails', () => {
       assert(config)
       assert.equal(config.log.merged, 'no')
       assert.equal(config.log.normal, 'yes')
+      assert.equal(config.customObject, testConfig.customObject)
       assert(!config.log.extraneous)
       assert(config.env)