I have a great expirience with Macromedia Director which have Behaviors very simmilar to actions. There we have user Behavior (actions) library and that is fantastic help to developers. With very few adjustments you can make game even if you arent programmer.
So I think that such library for 3dgs will be a huuuge help to all guys who dont want to mes up a lot with code.
Also there are lots of Behavior sites for director where everyone can upload behavior with all descriptions. I see no reason why we dont have it here. Lets make it!! I will contribute part of code from my DEXON game.
Cheers