asking for is the ability to hover over a file name to activate it
Hovering to pop up information is fine, but hovering actually changing things IMO is a bad idea (as I tried to discuss in a previous posting). The mouse will always come to rest somewhere when the user is done using it (and goes back to typing text, say). Oftentimes you just want to get the mouse cursor out of the way so you don’t care where it lands. If this happened to activate some tab I don’t care about right now, I’d be an annoyed user.
Note: I do know that a recent enhancement to Scintilla hides the mouse cursor when typing starts (I was fundamental in getting Scintilla to do that).