Just my two cents on some things I'd like to see being added for our use in DM.
1: Languages. We have spell and items that let you speak/read them, but no way of using the languages in the first place.
2: Moving NPC's and Monsters. I don't know how difficult this would be, put a patrolling guard makes stealth so much more fun.
3: More objects that can be used for puzzles in dungeons. Runes that light up when activated, more climbing and jumping type obstacles.
Just my thoughts I wanted to share. Love the game as it is already.