It's strange that no one has thought of doing this before. First, I'd like to suggest adding a "Bug abuse" category for "runs." The idea is that where possible, flaws can be exploited, even if they were intentionally left in by the developers.

Among the tracks where this could be applied are now: Ridge Rock Highland Circuit

This oversight ruined one of my runs where I am missed the start via return to track(teleport), although this is quite common on this track, this happened everytime.

Secondly and thirdly, I am would like to ask about when they will add a new track (called "Drybone Hollow") and consider one of my runs with "Aston Martin Valhalla" on Stunt Race?

This picture from "Drybone Hollow" track

Hiya! Great question(s) & suggestion(s). I'll have Infinity add the new tracks once they get a chance, and I'll chat with Infinity on if we should allow bug runs. The issue with bug runs is sometimes they get fixed later on which will then lead us to archiving said category as its a patched version and theres no way to rollback versions. I'll definately chat with Infinity on it tho.