That sounds decidedly NOT easy to add. The game's interface coding is annoying at the best of times; a royal pain at worst.What i would have expected to see is a highlight when you mouse over it. That's what most people come to expect from an interface like that, i'd imagine. Most menus in the game do already have this functionaility, so it should be possible to copy over some code from somewhere.
Though maybe @Levis has some not-too-difficult ideas?
In what menus do you have automatic tool tips??? The only ones I'm aware of require you to right-click on the interface items to get the details.
But then you might as well left-click and get to see the actual interfaces, rather than right-clicking it and it basically telling you to left-click instead.