Such a small, small issue that I have, but here goes:
I wish that the interface for quick search was nicer on the Windows application, bringing it more in-line with the Mac's "Switch To..." interface.
Also on the Mac, the shortcut is "CMD+J" for quick search/swtich, which makes sense since I think og J for Jumping to somewhere else, but on windows it's "CTRL+Q", which to be honest makes no sense and kills me when I'm context switching--I always forget that shortcut on Windows because I avoid that shortcut on the Mac as much as possible (since I think of "CMD+Q", which = Quit the application on the Mac).
In general, an interface refresh for quick searching would be much appreciated, and the ability to modify keyboard shortcuts for everything would be awesome. Just my 2cents.