[feature suggestion] Buildings produce units based on how many units are garrisoned

[Andy Alt]

I wonder if it would be a nice or interesting feature if buildings could have an extra attribute set. For example, a Roman military camp could only produce siege units if it is fully garrisoned, or the speed of unit production were based on how many units were garrisoned in the building (i.e. unit production is faster if fully-garrisoned, half the speed if half-garrisoned).

I don't think it would be a good idea for all buildings, but maybe it would be a good compromise for units such as the Roman military camp?

[Freagarach]

Affecting the unit production speed is already possible.

Not sure about the change in production queue. (At least easily.)