Oh I agree. I need more slots too

My guess is it wouldn't be that hard to do. I've just barely begun learning to mod, so I doubt I'd be the one, but if you go to the official Klei forums, you can post a mod request in the mods section. This sounds like something a lot of people might like, so you may have some luck.

Great idea. Best to move this to the Workshop area where it will most definitely be viewed by some of the more experienced modders.