No idea if the author hangs around here much, or if the emulator's even still being updated, but it's worth a shot.
I've got a request for a feature.
Long story short, I ended up with a new Hori Real Arcade Pro EX-SE arcade stick. The feel on the thing really reminds me of my old NES Advantage-- only one thing missing. I'd like to map two buttons to actually toggle turbo on the normal A and B buttons instead of being separate turbo buttons.