[Edit:] Also I'd be happy to help script things, haven't got much experience working with the NWN database functions though but if they work like PHP and MYSQL they aren't a real problem. Regardless of whether or not you choose to work with the spells and casting forms. I am an obvious proponent of including them though
Any thoughts on the Tome of Battle though? I bundled it in but you might not want it. It's a whole independent system from spells so it doesn't touch many resources other than your 2da's and TLK file and it might balance things out by adding maneuvers and feats for the martial classes. That way both the Spell Casters and the Warriors get something nifty.
The TLK ranges for it is well above Kaedrin's stuff so adding it is as simple as a copy and paste there. The headache is the 2da's and some spell scripts it touches of Kaedrin's.
As for my work. It's TLK range is directly above Kaedrin's but this can be copy pasted to be above the TOB or anywhere else.
2DA wise it just adds on the latest NWN2 spell entry and feats and hasn't overlapped. (barring any custom PW spells / feats not in Kaedrin's pack)