I think maybe something like copy/move hotkeys (like F5 ar F6 in other file managers) between panels could be very usefult and would add more usability.
Q-Dir works with up to 4 different panels, so it needs more flexible copy/move and navigation approach.
1) for each directory/tree view a number could be assigned (which could be shown in upper right/left corner).
2) Copy files from current to 4-th panel - F5+4, Ctrl+Shift+4 or smth like that.
3) Move files from current panel to 3-th panel - F6+3.
4) Fast switching between panels - Ctrl+Alt+1 [..,2,3,4] between folders and Ctrl+Alt+5 [...6,7,8] between folder trees. If folder tree view is "one 4 all", then Ctrl+Alt+0 would be switch to that main tree view.
IMHO, such hotkeys could make life much easer ;o) Thank you for your time.
I will give my best