We had a technicalquestion recently about how the "locked / fixed " roles worked with regards toavailability to other beltpacks. It turns out aROLE that is "locked" to one of the beltpacks will still show up inthe role selection menu for every beltpack on the system if that beltpack isnot connected. 
Answer:This is by design Normally you assign BPs to a fixed role when you want users to take care of their own packs, and have a few spareswithout roles tucked away out of reach.Allpacks in day to day use are fixed role, then there is no chance of a regularuser stealing your role (they can't pick as their pack is also fixed).
Regardingspares, if a pack with 'fixed' role xyz goes down during a show, the tech guycan grab spare pack 1 (which has no fixed role) and pick the old role xyz whilstrunning the pack out to me, all without touching the config. Nice and quick...Show goes on etc.Thecurrent behavior is in FSII as well .