Zoom in, Zoom out. I'm still not entirely sure if plug-ins will work like I think they will. Like, can I add new event commands? Add new event movement types? There's plenty of menu design elements I'd want to add, menu movement but the touch feature opens new possibilities for UI design, I'll have to stop thinking with arrow keys.
Grid Inventory. click and drag, if that's not already a feature. Maybe a context menu, like taping a npc makes them talk but tap and holding does something else. Steal, scan, lock on ect...
Particles? for Gem/coin drops that the character picks up.