Dear Forza gods, you have finally blessed us with open track days, as a mere peasant who spent most of his time in fm7 open track days, I am eternally grateful. It is already awesome and it feels like the true spirit of Forza! 
Only thing is cars don’t ghost when stopped, which is kinda fun at first, but is getting really annoying with the trolls.
It would be great to have best of both worlds. Have collisions on by default, but just ghost them if a massive collision is about to happen like in multiplayer.
And also ghost players who are stopped on the actual track for too much time. It’s fine if they’re off track. Perhaps an easy solution is to just ghost all players if inactive for more than say 20 secs?
Also, it would be amazing if the ghost wasn’t visible so players can still look at each others cool cars!
Many thanks!