If a track editor is made, they can be like BTB (bob track builder) or RTB (race track builder). I have used both programs for a long time, both are good, but RTB is more suitable and there may be extra object plugins as in these programs. Of course these are just suggestions. If they don't want to they may not do it, even these latest modded vehicles seem to be enough for players for a long time.
I'm gonna update suspension soon, i'm waiting new tubes from " E U R O B E A T ". it will probably be updated in 1-2 days and if have any suggestion write here because its can be last update.