As stated earlier in the thread XP works but you will not get wheelspin if you level with the button. You can boost XP to the point before level and then do something to get xp to trigger the level if u want.. but thats the only way to get wheelspins from the xp booster..otherwise you will just boost your level to a stupid amount and never get any..
As for accel its fine. You only need to tap it once or twice to get a nice boost.. suggest being in your highest gear lol.. but yea u can use this to 3 star alot of the speed traps and register online as a 35mph attempt but your singleplayer will read much higher haha.. I have a few around 300+ but on the leaderboard it shows much less. so thats good to know at least you arent hurting the leaderboards with cheating..
as for teleport it would be nice yes to have a way to use map or put coords but tbh dude once you get fast travel anywhere u dont need it..
A fun tip with jump and super speed btw.. start driving in the direction u wana go. press and hold jump till u good in the air a bit then let go quick and tap accellerator.. HAHAH enjoy your flight! xD
Its fun too for getting above invisible walls they wont let you get thru normally.