PC is no needed for choosing, copying booting.
All takss of multiboot are available in an addon plugin within enigma enigma and can be done there.
Even CSV images can be downloaded with the remote control in the meantime.
PC with FTP is more or less only needed to FTP new Images to /MB_Images directory and maybe for copying settings and plugins not available by online update or BP if your image has one (but this is not discussed here)
ciao
thowi