The menubar is basically wasting a whole row on its own, it would be great if we could move the addressbar (or any other bar) up next to it to fill the space in. Another thing is the bars don't save their positions after the program is quit but I already saw the bug report on this and look forward to when it's fixed.
Other than that this program is great. It has all the features you ever need in a nice clean interface that you can change however you like. Keep up the good work!
Edit: Just thought of this too
Change default icon size, I use the "tiles" view in explorer and they are slightly bigger so it would be nice to be able to change this in the options to 32 (default) or 64 etc.