Before I switched to UDK , I was using Unity 3D.
In Unity 3D there is this feature that allows you to tweak (change) variable values while the game is playing.
Then when you close the game the variables switch back to the original values in the editor.
This allows you to have a lot of freedom in tweeking and testing out your variables,values and properties before making official changes.

It would be nice if UDK also had such a feature.
Will UDK have that in the next release ?
Please,please,please,........