Yeah, have them activate STEALTH, and JUMP modes on your car.
See if they can DE-activate that pesky speed limiter while they are in there.
About the only thing they can activate or reset is your Service Indicator Lights.
(I would just make my own tool to do that, though, costs about $5 as opposed to $40 or whatever they charge for an oil change nowadays.)
'86 325es (TURTL3): PJ peetsa hawler
'87 535is (BADWATER): almost done... really.
'86 325e (GRN HLL): DD/show/rocket
'04 x3 3.0i: Wife's Bimmer (manual, woot!) My BMW Blog