It would be nice if you could place macros onto the game table, this would make it easier for GMs who use lots of macros to keep track of which goes where. It's also very useful for Mentors with the Roll20 API since you could have minor triggers listen on the map. i know you can place macros in the quick bar, however this is limited by your screen width so with a 1920x1080 monitor you can have ~15 depending on your macro naming.