It seems the alternate spell system casters all lack defensive casting mode. I'm sure of this with at least the warlock, psion, and dragon shaman. I know nothing about module work, but since the only workaround I've had so far is to take a level of an original casting class, it made me wonder if a workaround would be to simply give the class some useless cantrip in the standard system? If you don't want to or can't create a custom spell for this, just make it something that is kinda pointless, like light or... just about any noncombat cantrip available to the sorceror.
