that was me, but I think you're talking about 2 different issues here.

When I use auto-hold and stop, it will "catch" the parking brake when fully stopped. When I go, there's sometimes an audible sound when it releases.

The issue you linked to above, is a thump that you can actually feel - a slight jolt (which happens on brake release, not necessarily acceleration). A programming helped that one.

The auto-hold sound I've taken as normal.

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'08 X5 3.0si - Alpine White / Saddle Brown interior
Specs: Sport Pkg, Premium Pkg, Tech Pkg, Comfort Access, Aero Kit, Style 433 staggered 20s on Conti DWS
Mods: Carbon 35 tint, LED angel eyes, GP Thunder 7500k fogs, H&R 20mm/25mm spacers, clear reflectors, gunsmoke-tinted taillights
Coded: Digital speedo, windows/sunroof/tailgate close via keyfob

X5 pics at Flickr