Don't require a key to be held down for dot spreading. If anything, have it be a keypress "on" and "off" switch for dot spreading to make it less hectic if you're on the move. With keybinds the way they are with Druids, your best bet might be to have it work similar to the Paintballer's (i.e. if you tab target, it puts the appropriate dots + rotation).
I'd say try and get with him about working your ideas into his existing rotation. It seems to be doin pretty well, though I'm glad you're on top of this
. I know you and I had some ideas on how to make his viable for PvP and from what I understand, he's not doing a major update until the new PQI is released.