Minimap Object - for making minimaps easily... would be nice if they had a "scale" feature as well so you could toggle the area around the tracked object easily.
There already is one
Inventory Control Object - Inventory control has always been a struggle in making any kind of RPG game, or any game really if you can carry more than 2 things at a time... Some kind of inventory with visual array would be really nice. This is the one thing that always annoyed me the most when making RPGs, and is usually why I never committed myself to sticking with an RPG style game... Making inventory screens that work well always sucks.
This is a really good idea.. could go as far as to make it fully automated, so you can 'add' an object to the inventory and it'd take care of drawing it, doing drag and drop, etc.