Please see the most recent updates in the "Where did the .com name go?" thread. Posts number 16 and 17.
Yes changing aircraft mid flight will shut your engines down, like most new releases that have advance coding ie PMDG, Cerasim & A2A the engines will shut down when swapping models. Its a trade off for abilities of the aircraft, sadly there is nothing you can do about that
What config change are you worried about? the "HIGHMEMFIX=1" entry? its one of the more nessesary fixes for your fsx.cfg these days, not only does milviz recommend it, but many developers and tweaking sources do as well including many members here.
I'm seriously considering to buy this...looks really good.
In the meantime, some suggestions for repainters: Cavallino Rampante, Lancieri Neri and Frecce Tricolori aerobatic teams all had the F-86...
http://www.panterenere.it/MIX1976/PHOTOS/RIVOLTO/rivolto.htm