Anyway, it just so happens that I implemented frameskip in R10 on Sunday, so expect this to be a supported feature in the next official release. I had been planning to add this to R9, but I forgot :) It's no big deal - it's about 20 lines of code.
It does give a slight speedup, but not always as much as you'd expect. For instance, skipping every other frame won't double the framerate, as not all the time is spent rendering. Paradoxically, it tends to have more of an effect on roms that are already running fairly fast. Hopefully for some roms it will make the different between them being barely playable and playable though.
There are a few other things people have been asking about which I will implement for R10 too:
- A configurable deadzone for the stick
- A configurable framerate limiter