diff --git a/docs/internals/configuration.md b/docs/internals/configuration.md
index ab9dbedf7..162904607 100644
--- a/docs/internals/configuration.md
+++ b/docs/internals/configuration.md
@@ -48,6 +48,8 @@ the following way:
 ```coffeescript
 # basic key update
 config.set("core.autosave", true)
+
+config.pushAtKeyPath("core.disabledPackages", "wrap-guide")
 ```
 
 You can also use `setDefaults`, which will assign default values for keys that
diff --git a/spec/app/config-spec.coffee b/spec/app/config-spec.coffee
index 41933f2db..2ca2045b8 100644
--- a/spec/app/config-spec.coffee
+++ b/spec/app/config-spec.coffee
@@ -41,6 +41,28 @@ describe "Config", ->
         config.set('foo.changes', 1)
         expect(config.settings.foo).toEqual {}
 
+  describe ".pushAtKeyPath(keyPath, value)", ->
+    it "pushes the given value to the array at the key path and updates observers", ->
+      config.set("foo.bar.baz", ["a"])
+      observeHandler = jasmine.createSpy "observeHandler"
+      config.observe "foo.bar.baz", observeHandler
+      observeHandler.reset()
+
+      expect(config.pushAtKeyPath("foo.bar.baz", "b")).toBe 2
+      expect(config.get("foo.bar.baz")).toEqual ["a", "b"]
+      expect(observeHandler).toHaveBeenCalledWith config.get("foo.bar.baz")
+
+  describe ".removeAtKeyPath(keyPath, value)", ->
+    it "removes the given value from the array at the key path and updates observers", ->
+      config.set("foo.bar.baz", ["a", "b", "c"])
+      observeHandler = jasmine.createSpy "observeHandler"
+      config.observe "foo.bar.baz", observeHandler
+      observeHandler.reset()
+
+      expect(config.removeAtKeyPath("foo.bar.baz", "b")).toEqual ["a", "c"]
+      expect(config.get("foo.bar.baz")).toEqual ["a", "c"]
+      expect(observeHandler).toHaveBeenCalledWith config.get("foo.bar.baz")
+
   describe ".getPositiveInt(keyPath, defaultValue)", ->
     it "returns the proper current or default value", ->
       config.set('editor.preferredLineLength', 0)
diff --git a/spec/app/project-spec.coffee b/spec/app/project-spec.coffee
index 6180ceb23..239c56d40 100644
--- a/spec/app/project-spec.coffee
+++ b/spec/app/project-spec.coffee
@@ -180,9 +180,7 @@ describe "Project", ->
 
       it "ignores ignored.txt file", ->
         paths = null
-        ignoredNames = config.get("core.ignoredNames")
-        ignoredNames.push("ignored.txt")
-        config.set("core.ignoredNames", ignoredNames)
+        config.pushAtKeyPath("core.ignoredNames", "ignored.txt")
         waitsForPromise ->
           project.getFilePaths().done (foundPaths) -> paths = foundPaths
 
diff --git a/src/app/config.coffee b/src/app/config.coffee
index 5fbb5e08e..0b0de9cb2 100644
--- a/src/app/config.coffee
+++ b/src/app/config.coffee
@@ -144,6 +144,30 @@ class Config
       @update()
     value
 
+  # Push the value to the array at the key path.
+  #
+  # keyPath - The {String} key path.
+  # value - The value to push to the array.
+  #
+  # Returns the new array length of the setting.
+  pushAtKeyPath: (keyPath, value) ->
+    arrayValue = @get(keyPath) ? []
+    result = arrayValue.push(value)
+    @set(keyPath, arrayValue)
+    result
+
+  # Remove the value from the array at the key path.
+  #
+  # keyPath - The {String} key path.
+  # value - The value to remove from the array.
+  #
+  # Returns the new array value of the setting.
+  removeAtKeyPath: (keyPath, value) ->
+    arrayValue = @get(keyPath) ? []
+    result = _.remove(arrayValue, value)
+    @set(keyPath, arrayValue)
+    result
+
   # Establishes an event listener for a given key.
   #
   # `callback` is fired immediately and whenever the value of the key is changed
diff --git a/src/app/package-config-panel.coffee b/src/app/package-config-panel.coffee
index 137ca6851..febfc8978 100644
--- a/src/app/package-config-panel.coffee
+++ b/src/app/package-config-panel.coffee
@@ -29,12 +29,10 @@ class PackageConfigPanel extends ConfigPanel
     @on 'change', '#packages input[type=checkbox]', (e) ->
       checkbox = $(e.target)
       name = checkbox.closest('tr').attr('name')
-      disabledPackages = config.get('core.disabledPackages')
       if checkbox.attr('checked')
-        _.remove(disabledPackages, name)
+        config.removeAtKeyPath('core.disabledPackages', name)
       else
-        disabledPackages.push(name)
-      config.set('core.disabledPackages', disabledPackages)
+        config.pushAtKeyPath('core.disabledPackages', name)
 
     @observeConfig 'core.disabledPackages', (disabledPackages) =>
       @packageTableBody.find("input[type='checkbox']").attr('checked', true)
diff --git a/src/stdlib/underscore-extensions.coffee b/src/stdlib/underscore-extensions.coffee
index 8251cbcd1..af28237d9 100644
--- a/src/stdlib/underscore-extensions.coffee
+++ b/src/stdlib/underscore-extensions.coffee
@@ -4,6 +4,7 @@ _.mixin
   remove: (array, element) ->
     index = array.indexOf(element)
     array.splice(index, 1) if index >= 0
+    array
 
   spliceWithArray: (originalArray, start, length, insertedArray, chunkSize=100000) ->
     if insertedArray.length < chunkSize