I was having lots of trouble with vp7 so I gave 8 a try. It does work pretty good, I just have had trouble with exit. The closest I can get it is when you hit to exit, you need the trackball/mouse to click a confirm exit button from pinmame, and then I think I had to close vp8 with the mouse.
Maybe someone else using a keyboard emulator instead of a gamepad has had more trouble. But the games seemed to be working correctly.