It wouldn't matter though if Rich 'beat' your 2wd if he were driving a 4wd because even though your on the same track at the same time, your actually in a different race.
Now if Mr Lowe was constantly beating your 4wd with his 2wd *that* would get annoying, as well as being soul destroying
Seriously though I understand it wouldn't be ideal and it may be complicated to set up the system. Just a random thought....
G