I think this has not been done before for any Commodore program. Switching between native and 1581 modes is done within the Wheels Toolbox application. Four drives can be simultaneously installed. Topdesk uses four drives, but requires that at least one be a RAM drive. All four directories can be simultaneously open and viewed as windows on the desktop.
Copying can take place among all drives, even if the destination drive window is closed.
A move instead of a copy can be forced by the use of the Commodore key during a copy. The system tells in advance whether the destination drive has sufficient room for the file to be transferred. What is copied only becomes visible after the destination drive becomes the active window. GEOS 2.0 requires that the drives used be in the first two drive positions. Swapping is probably a good idea even with Wheels.