Top article on one of the most difficult topics. I think a lot of the info is relevant for all types of racing not just ST's.
I am new to RC, but know a little about cars, and wanted to add some more about the notes on camber:
The comment about wanting negative camber is spot on, but it is not just about chassis roll. If you think about the lateral (sideways) load on the tire during cornering, it sort of wants to peel the tire away from the wheel. This lateral load causes uneven loading on the contact patch of the tire by biasing the load towards the outside (with respect to the corner) of the tire. By adding negative camber, when going straight the load on the tire contact patch is biased, but as the lateral load increases during cornering the tire deforms causing the load to be spread more evenly, and hence increasing the cornering performance of the tire. In a full size car having high levels of negative camber limits braking performance in a straight line, but this shouldn't be an issue in the RC world (provided you don't have front brakes!).
Chassis roll and suspension geometry is important because as the chassis rolls and the suspension compresses, the orientation of the wheel with respect to the road changes usually tending towards positive camber (as described in the original post). So what you want is the tire to lean in slightly (negative camber) during cornering, and this can be achieved via camber gain (depends on the suspension geometry, in particular the length of the upper control arm versus the length of the lower), or static camber (what we're interested in).
One last point of interest:
Of course the ideal situation would be for the car to have reactive suspension meaning the tyre can be vertical all of the time, but it hasn't yet been invented.
A beam axle behaves like this because the wheels never move with respect to the road, but they aren't ideal because they don't handle single wheel bump very well. Ideally the suspension would provide the perfect amount of camber at each different cornering speed/body roll condition. The problem is knowing what the ideal amount of camber is, because it is highly dependant on the tire characteristics, which are probably the most complicated thing on the car!
Sorry didn't mean to get so nerdy, but i find this stuff interesting. Once again top article, suspension tuning is so confusing because everything is inter-related.
Cheers all, hope you found this interesting/informative.