it would be of great strategic advantage to be able to move a space station to a already captured planet!
they did something like this in the star trek series DS9 when they first found the worm hole they need to get closer to cover and defend, so they used the deflector to help the shield and increased the orbital thrusters to move! this was done only once as it was not designed to move.
so for our captured station maybe we could move it just ONCE only by building a new engine only available on stations s.u.i.t.e. (single use instant travel engine)
you would need to build one level of engine on the station ( requiring a field for only lvl 1)
1 lvl engine for each system you want to travel 
1 lvl = 1 system, 10 lvl = 10 systems
but once you use the engine it burns out leaving a radioactive mess so can not be built again unless recaptured
because it is not a normal engine it would take no fuel just cost to build
maybe because it is a instant jump warping into place it could occupy any vacant planet space by shifting the planet out of phase and sitting its place, if some one captured the station the planet would return  

If you could move Space Stations, every big Player had one nearby.
Or the big Alliances would create some Systems, specialist in ship building
near their center.
So no chance for a normal player to get one.
 
 
 
 

the station have different scores so there are ones for weaker players

agree , good point Shane