I can verify that Flashme can be run from the SD card slot at this point. It has a nice looking icon in the new Menu (0.6beta2) as well. Everything went smooth while running from the Menu program and SD card slot, and on my really old NDS (silver with version 1 firmware), no SL1 shorting was required.
There definitley is potential in the beta menu program, and if it continues evolving at the rate it's evolved so far, then current MK2/3 users will be in a very good position in not that long...
I wonder though, what we'll see from a new Flashme version, or if we've reached the 'as good as it can get' point with Flashme V7.