Could you not make it so you can save a layout for single player- so you can practice on it etc. but cannot use it for multiplayer?

Absolubte anachy on LFS would be pretty cool though...

On the Kyoto Ring the AI go mad and have massive crashes- like they can't even see each other and will have a crash that will take half of them out , but only on the Oval, and then they can't even get back off the grass when they end up on it.

YES! i've been thinking this would be a good idea too
but also editable chalk- so you could write stuff in chalk?

What about editible chalk text- so you can create messages to be written in chalk?
or even editible signs too- could work just like creating skins