The only one that truly comes to mind is Combat Elementalist.

I would take that first with every invoker I roll.

I also think it would be really easy to turn it into a class spell/edge combo, without boosting the power of the edge, as all, as follows:

1. Combat Elementalist as a class skill gives a 2 round lag when the touch is cast during combat.
2. Combat Elementalist as an edge boost gives a 1 round lag, as the edge does now.

Then, I'd at least think about it for a couple hours before taking it first. :)