I've just tried the ks1 and besides the shifting lag that some others just reported (not as bad as it seems IMHO) I've found that you've set autoblip on by default in this kart...
Why not to include that in some driving aids?
Autoblip is when revving up the engine when downshifting and it's included in the some arcadish game on the market,but I think this is not the case to set it on by default (or at least keep it free to set it off by the host)
It would be great fun to revving up in donshift by ourself isn't it? ;)
PS:would be great also to have the engine stalling when you stop the kart in 1st gear and do not press the clutch