Is there a way to limit the number of starbases (by types) in a particular area?

Per example to make more powerful starbase (more bonuses), but limited to 1 starbase per planet.

So, in other ways than by the distance limit in hexes between starbases.

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Is there a way to add conditions to the construction of a starbase?

The player needs 10 planets before he can build a starbase.

The player needs to built this improvement before he can build a starbase.

Etc.

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Is there a way to make a starbase can move, with a specific starbase module?

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Is there a way to change the delay for the construction of starbase modules, so they can be built instantly instead of next turn?



***** If that is not possible, consider it as a request. *****