Sis 300/305 Card how can i overclock or atleast change some meaningfull settings?

[Chesso]

Iv'e got my Sis 300/305 32mb card in atm and i downloaded the latest drivers for it from Sis.

Now the little manage utility thing that comes with it is well pretty much useless to me and to top it off most of the buttons are disabled :| i can only change video overlay and gamma corection.

I want to try overclock it a bit or atleast get access to the disabled buttons.