So is there a way to edit the rogue and zerker group combat abilities from the standard eyes etc to a custom spell?

That's a good question, I'm not sure there is. I'm not terribly familiar with either class, do you have an example name for one of the spells? The non-custom version I mean.

I'll have to go through the source but I'm assuming it'll be hard coded. If so that would be a good target for a tweak to the code.

Nevermind, yeah it looks like the spell IDs are hard coded. I didn't immediately see a way for a player to alter them. It's pretty extensive, I'm not sure how crazy it would be to make it more flexible. I need to fully go through the code to be sure. If it needs updating I'll have to think on it for awhile, there might be a clever way to tweak it. S0rcier has been lurking lately, if were lucky he'll drop in.

ouch. Was hoping that wasn't the case.