Save imported ROMs with unique names

[molul]

Is your feature request related to a problem? Please describe.
Yes. The problem is this: playing an imported ROM in RetroArch on the Mega Drive mini, if you save a game remap, it will be saved as rom.rmp. If you then play another imported game, RetroArch will load the rom.rmp file automatically because all imported games filenames are apparently "rom.bin" (as this hasn't happened with built-in games, or at least some of them I tried).

Describe the solution you'd like
If imported games kept the ROM file name, it had an unique file name, I could just save a remap for certain games and never have to delete and relaunch. Or maybe a way to rename certain ROMs would be enough.

Describe alternatives you've considered
I couldn't figure out any alternatives.

Additional context
I use a game remap for Mega Bomberman when playing a 4 players battle. I currently set controller 2 to md 6 button+4way play, save game remap, exit, launch the game again and then it's working. Then when I switch to another game, I delete the game remap and exit, then load the new game.