Idea for SEV - sort of.

[Alneyan]

I tend to produce a *Colony Finished satellite/platform on every planet I won't use in the near future, that production being on hold obviously.(Or it could be "Shipyard not needed" or something along these lines in other circumstances) Sorting the planets/bases by queues shows what space yards are idle, and allow to go to them fairly easily.

And there are other ways as well to deal with these queues, once the Empire becomes to be fairly big, like what JLS wrote.