On another note, will testers be able to sell games made with the most current release?
I think the test builds should not be for commercial use - testing purposes only. I think it's fair if you sell a game, you buy a license first.
Since you're working on movement actions, would it be possible to add bezier movements, which could be run in a queue?
That's probably something for a behaviour to do - these are super-basic primitives that are very often useful for a wide array of uses.