Ok, you don't have to choose between NOR or PSRAM, it detects what the rom is automatically and loads the game correctly for you.
I was using YSMenu before to run my 3 in 1 so I couldn't tell you if it's compatible with Exploaders saves but I can tell that it's not with my old YSMenu's, it seems to save the game as .gba.sav so I don't think it will be.
Right last thing, you don't back up or restore the SRAM - SAV when you load the GBA rom again you're last save is loaded up with the game like DS roms, so you just carry on where you last saved in the game.
The thing is that it's quick to load, even NOR's, it just feels like your loading up DS roms, it just really neat and tidy, excellent bit of firmware.
Hope this helps.