You can't use the EMS flashing software to put multiple LSDj roms on one page of the flash cart, or so I understand it: LSDj doesn't like sharing a cartridge with other programs. So, every page you put LSDj on should only have LSDj.
Right now, one of my carts has LSDj 4.6.7 on Page 1 and 4.6.2S on page 2, both patched to the brim with my preferred custom kits.