i suspect adaptive m suspension is a great option, but its hard to find out much info on how it works. i assume its actually just firming up the dampers.
having read up a bit about the abc merc suspension i had on an sl500, its actually more complicated than i remember and was fully active with hydraulics - lots of horror stories about how much it costs to fix now...! it was brilliant at keeping the car totally flat in corners though.
must say keen to try a good f31.
E91 330d Touring M Sport Auto 2006
225M 19" MV4 + Falken 453
M3 270M 18" rims + Vred Wintrac Extremes