for %f in (*.smc) do copy %f sfRoms\sf%f
That would make new copies of all the roms prefixing them with sf. But then a lot of your filenames would be more than 8.3, so to make them all 8.3 again you could do this--
ren ????????*.smc ????????.smc
That would do it, by cutting off any extra letters in the filename after the first 8 chars.
If you find one command line for Ucon or whatever to convert your roms properly to sf7 format, you can do them all using a for command again, doing something like this: (inserting the correct options of course)
for %f in (*.smc) do ucon %f
Anyway, I don't have an sf7 or anything but just thought I'd mention this. Basically renaming and conversion won't take more than a few minutes, so you shouldn't let that stop you from getting the copier you want.
Feel free to email me if you get one and have any questions on how to do this.