(i just posted this at BCS also)
ya thats been a major problem as to why no one could change an SP bridge was the character animation issues (not only bridge crew, but when characters walk on or off the bridge like Saffi, Felix, Korbus, Data, romulan guy, etc) as well as a few other bridge-specific animations... also, some bridges dont have an "extra" seat that Data and romulan guy sit at as on the Sovereign bridge...
but if that could be overcome, that would be an awesome thing!! i imagine everyone would take a new interest in SP if they could pick and choose which bridges they would want for the missions