You can now specify additional ease function values via the easeParams property.

Author: photonstorm

v3/src/checksum.js

@@ -1,4 +1,4 @@
 var CHECKSUM = {
-build: '7eb44670-4029-11e7-aed7-5bc93456becc'
+build: '54a28910-4032-11e7-bbd7-b5cbb879efb2'
 };
 module.exports = CHECKSUM;

v3/src/tween/GetEaseFunction.js

@@ -1,11 +1,27 @@
 var EaseMap = require('../math/easing/EaseMap');
 
-var GetEaseFunction = function (ease)
+var GetEaseFunction = function (ease, easeParams)
 {
     if (typeof ease === 'string' && EaseMap.hasOwnProperty(ease))
     {
-        //  String based look-up
-        return EaseMap[ease];
+        if (easeParams)
+        {
+            var cloneParams = easeParams.slice(0);
+
+            cloneParams.unshift(0);
+
+            return function (v)
+            {
+                cloneParams[0] = v;
+
+                return EaseMap[ease].apply(this, cloneParams);
+            };
+        }
+        else
+        {
+            //  String based look-up
+            return EaseMap[ease];
+        }
     }
     else if (typeof ease === 'function')
     {

v3/src/tween/ReservedProps.js

@@ -5,6 +5,7 @@ module.exports = [
     'delay',
     'duration',
     'ease',
+    'easeParams',
     'loop',
     'loopDelay',
     'offset',

v3/src/tween/TweenBuilder.js

@@ -202,7 +202,8 @@ var TweenBuilder = function (manager, config)
     var props = GetProps(config);
 
     //  Default Tween values
-    var ease = GetEaseFunction(GetValue(config, 'ease', 'Power0'));
+    var easeParams = GetValue(config, 'easeParams', null);
+    var ease = GetEaseFunction(GetValue(config, 'ease', 'Power0'), easeParams);
     var duration = GetNewValue(config, 'duration', 1000);
     var yoyo = GetBoolean(config, 'yoyo', false);
     var yoyoDelay = GetNewValue(config, 'yoyoDelay', 0);
@@ -226,7 +227,7 @@ var TweenBuilder = function (manager, config)
                 targets[t],
                 key,
                 GetValueOp(key, value),
-                GetEaseFunction(GetValue(value, 'ease', ease)),
+                GetEaseFunction(GetValue(value, 'ease', ease), easeParams),
                 GetNewValue(value, 'delay', delay),
                 GetNewValue(value, 'duration', duration),
                 GetBoolean(value, 'yoyo', yoyo),