3rd party software that can customize touch drag?

I'd like to have a "drag a window" action happen if I use one finger on the touchpad to move the mouse, and at the same time, hold down the command key on the keyboard.

I have looked at BetterTouchTool (seems to be the most popular solution to mouse customizing) but it does not seem to support customizing touch drag type functions.

 

Not sure if the lack of replies means this is for some reason not possible??