Sounds confusing doesn't it?
So herez problem:
I have at least 6 keys bound to the gui's for some of the different add-on's I have installed.
Every time I install a new one, I have to find a new free button for a gui that I'm probably only going to use once.
Solution:
A single gui that has a list of all of the other addon-related guis installed. Double-click a name to close the gui selector and open the addon gui.
I suggest adding a way to select which guis show up on the list. And a way to name them.