The shake and shimmy at overspeed is called realism...believe me the real concorde shakes and shimmies as it hits the Transonic region.
a lot and have sourced a number of Concorde models to replace the FS2000 one which has been omitted, thus far the French Projet Mach2 model has proven to be the best although you can't change the tail number from G-BOAD.
I agree with Danny, I think Microsoft removed Concorde because of its Anglo/French origins and the fact that Boeing (also from Seattle) probably spat their dummy out at a mutually attended event. It could have been left in for the enthusiasts rather than the casual flyers, who never progress beyond prop-driven simming, especially in a product which claims to be a celebration of "A Century of Flight".
There is apparently a collection of BA
liveried planes available for FS2004 (at $19.95) though I haven't tried these yet.