Pretty much any high end aftermarket computer can do launch control (stationary rpm limit), flat shit (ignition cut) and anti-lag (ignition retardation). None of them are particularly fancy things for a computer to do. 95% of current model Group N rally cars run all 3... But remember that flat shift has to be in conjunction with dog engagment gears. You can't do it on synchro box. So for a street car you could get helical cut gears put in a dog box for the best of both worlds... just don't drive tired and you'll have no problem shifting gears...