IcePack
Sims are set up to meet the equivalent test schedule for the type. Most sims handle the same at 35000ft as they do at 14000ft which is definitely not the case for the aircraft. Sorry would have no idea of the source document for that.
Trouble with negative training is that it may be of benefit to get pilots to hold attitude & power but could lead them to believe that the handling is easy which in an A330 at height with an aft C of G due trim tank it is not. Hence in a surprise situation (in real a/c) they may over control or disbelieve the indications.
Whatever, the simulator industry needs to address this short coming IMHO.
Read it somewhere, however couldnīt find it. Stumbled on another pdf though.
Validation of stall recovery technique and training from Airbus March 2011
edit: another look from april 2012
aviation week