Good mod, excellent work, you definetly made Moto 3 races more fun to play... One minor suggestion:
Curbs are too slippery ( so if you can decerease it a litle bit it would be perfect, in real life a lot of riders use CURBS to improve their lap time so i think that you should work on that a litle bit more)....
I like how you made AI more competitive like in real life and they are in one big group,
Also the grass and gravel are done great with amount of slipperiness...
Very good mod if you made minor adjusments it would be perfect...
Keep up the good work
Love the mod