You can go to TGTAP's Download Database, San Andreas, Tools and download the SA Replay Handler, it lets you record many replays, and when you press F2, it doesn't replace it.
Hmm, I think you'll have to do a brand new sabre.txd and sabre.dff, because the others have the wheels and it's pretty impossible to arrange the dummies.
I don't recommend making a brand new mod in the original files.