Here's a theoretical question about interactions (pardon me if it was asked 1000x already): is it possible to add interactions to items?
No, currently it's not possible.
(I believe you can add syndromes to weapons with DFHack, but I don't know how that works.)
You mean adding contact poison syndromes to weapons which can grant abilities to creatures?
With DFhack you can dynamically add / remove access to interactions based on what items they're using (so you could give them access to particular spells while they're wielding a certain type of wand). I could've sworn there was something out of the box for this, but the closest thing I can find at the moment is
modtools/item-trigger. It's a shame that I got bored / too indecisive when I was making a Guild Wars adaptation (I couldn't decide what way I wanted to implement magic), because I was going to make a whole resource for handling spell-granting items and special magical effects that would be very useful right now... >_>
Edit: In fact, I might throw something basic together. Sure, today
was going to be the day I was supposed to actually knuckle down and fully focus on a project I've been slowly dragging out because I can't focus on things, but I'm sure that can wait
Edit Edit: And by "might throw something basic together" I mean I currently am working on a script for it.
Edit Edit Edit: I finished it and got everything ready for release, only to decide that it'd be better off using item-trigger and trying to make adjustments for reliability...