i think it would be nice and useful to have kerbs beside the other objects. most useful for autocross, to help determin better the turn in front and negociate it properly...because lines or barriers does not do the trick it will also be very useful on other tracks .. to help determine a new corner for example... and i dont think it would be very dificult to implement this. 2 or 3 angle variasions, solid object that will be fixd into the ground.
it is a personal opinion though...
it is a personal opinion though...