Currently, the PBP options in this monitor seem to be limited to 1/1, 2/1, and 1/2 options. Could you add extra options like 3/2, 3/2, 4/1, 1/4?

In 2/1 sub-device takes a large part of the screen, too much when using e.g. a phone as sub-device.

Or perhaps there is already an option to do this using ddm.exe? I've tried multiple commands but none worked.