I'm splitting my time between developing and playing, and with a full-time job the two add-ons I have have taken a lot of time >_<
However, as of last night I realized that I really, REALLY would like something like this. I plan on starting when I get home this evening, but I have a hectic week and haven't done a lot of research (lawl) into this add-on yet so I can't give you an estimate on when it'll be done.
HOWEVER however, this add-on has a lot of similarities with my Inventory Grid View mod and possibly the same function hook, so I luckily already have a good amount of working knowledge on the inventory controls system
