I am using Win XP.
Me too :-). Can you send me a screenshot before and after moving the splitter? Maybe it happen only with certain placement of the bars.
1 : ability to change the background color of the panels, maybe individually.
I have this already on the wishlist. However I do not like idea of changing colors, because it may conflict with Windows schemes.
2. undockable, and movable folder Tree list (in NC interface)
You want to have the tree in separate window?
3. A history of the folder access (like in any web broser).
Last 5 directories are in drop down menu on "back button" (like in web browser). Complete history is in drop down menu on "Open directory" dialog.
4. (an old one) Ability to minimize winSCP to system tray.
It is also still on he wishlist, but also I do not like it. I do not think that WinSCP is the kind of program to be placed in the tray. Anyway, there are plenty of tools that can place any program to tray. See respective entry in Putty wishlist
5. Baloon tooltips for background notifications.