Disable rear diff lock auto disengage?

["Brandon Hull" <brandon@cardinalventures.com>]

The rear diff lock on my CQ (and all Torsen audis?  US Audis?) automatically
disengages when the car hits 15 mph.  Has anyone contemplated the wisdom (or
lack thereof) in disabling this feature?

The more I cogitate over the implications, the more confused I get.  Would
Torsen eliminate the prospect of power-induced oversteer with rear diffs
locked?  Or even if in response to the rear wheels spinning faster than the
fronts, torsen sends power forward, might the torque remaining still be
capable of spinning the rear tires sufficient to generate oversteer?

Has anyone done it?

Brandon Hull
'91 CQ ersatz S2