Currently you only can have PC at the left and Unix/Linux at the right panel in WinSCP.
Request is to allow both panels to be Unix/Linux. Or, possibly, both panels to be Windows but the existing app called Total Commander is the king in this area for decades and possibly is difficult to overcome. Basically this request will make WinSCP a tool resembling Total Commander but for handling Unix/Linux via PC. Unix/Linux people without such graphics users interface still work like Neanderthals.