So, with NWNX we can make things happen when someone enters/exits a combat mode (Expertise, defensive casting, rapid shot, etc.) and have these effects go away when the mode/stance is broken.
We could do really cool stuff with this, and basically allow feats to augment perks similar to how SF: and GSF: can augment spells.
For example: Instead of giving an AC bonus, expertise could trigger the desert warrior perk's damage shield at the cost of more AB penalty?
Power attack could offer access to different types of damage based on perks, and so on.
We could do some wild stuff with this, if the interest is there...
This is an interesting concept. Something I like it would make it a tad more interesting for those feats. Though it could also change the balance a bit. So it could be tricky I guess. Though certainly worth looking into.