Ah, I thought you were talking about editing in the OS. Yea my bios lags on the mouse too. I think it might be to do with the USB interface. I used a ps2 mouse at one stage it was smooth but that's not exactly a fix! Honestly I have tended to use the cursors where I can but the lag doesn't particularly bother me anyway
As for offset overclocking - it's the ideal method because you effectively just increase the turbo instead of having a fixed state. For example:
A stock cpu @3.4ghz may use 1.2V.
The turbo @ 3.8 may use 1.25V.
The offset is the difference between the stock and turbo volts. So in this case +0.05V.
So to offset overclock you just set the turbo to 4.5 and the offset to +0.1V.
So effectively you've made an overclock of 4.5@1.3v but the cpu will only turn on the turbo when it needs to.
I think actually this might be possible in the MSI bios but it could be hidden away. I remember seeing an enhanced turbo section but I haven't actually had a look in there. In fact I'm working away from home so haven't seen my pc in a few weeks.
However offset isn't as stable as fixed voltage because of the jump in volts and the vdroop issue. The bigger the gap between the stock and turbo the less stable it will be.
Anyway, I was planning on doing a thread on my experience with overclocking the 3570k on the GD55. It will be a place where we can all share our experiences and I was planning on adding graphs comparing people's speeds and certain volts and how people have gone about getting their OCs, best practices and methods etc.