The dynamic framskip sounds like it could be a really good idea.
I'm assuming that you played Uridium on the H300 simulator and not on a H300 device? I still can't play it!
When the game loads up, I have kempston chosen, and then press '3' to choose single player 'joystick', but no joy when I press fire (play). I can't get it to work with key mapping either as there is no option for SYM SHIFT. Sorry to carp on, but Uridium is such a classic!
Cheers for all the hard work.