I wish for project groups in the IDE. For those that might not know what this means, basically you can have multiple projects loaded in the IDE. When you play, the "active" one is ran.
A great example might be a "supporting library". you could have it opened in the same ide, recompile a new feature and voila, start using it without bouncing around. It all comes down to productivity. Minutes add up to hours, hours adds up to days and so on...