Yeah, it took many hours of research and many CDs worth of failures to get to that stage. Not to mention a good many minutes this morning typing it all in!
Basically the process is the same for all drivers, but you just need to change little bits here and there.
I'd just like to point out that it is VERY IMPORTANT that you get the correct volume label for your CD, otherwise Windows will claim an internal structure failure (i think). I must have used a good 4 or 5 CDs figuring that one out!
Essencially, you can add any drivers you want to it, by just adding them in at STAGE 2B and STAGE 3. However, for fundemental drivers (such as the SATA ones) it is more complex, and they need adding in sooner.
Also, be prepared to have several attempts at this...I'll be very suprised if someone manages to get it right first time.
Once I've bought more CDs (I've run out now :/ ) I'll have a bash at making it SP1 & SP2 streamlined, with better-than-basic nVidia and ATi drivers built in and with all the standard nForce2 drivers. I'll post it up here again when I get round to it