Hi,
Yep, indeed, you are right, they don't work. It's nothing to do with PlayMaker, even a regular Unity monobehavior will not be working for exit, over and drag...
so currently, indeed rely on DFGUI custom actions. Also, the added benefit is that it will comply with touch and various features, which will bring more on the table then if you just plug the regular events.
Have you contacted DFGUI author on this? if not, I'll do it, I have a couple of questions anyway to add to the list.
Bye,
Jean