You can queue strike craft in hangers before they are built, it feels like this is simply an oversight. Either way, it is annoying. First of all, it creates a time window when there could be strike craft built but there are not because I have not noticed my hanger bays are finished yet. Secondly, to keep track of which starbases will need strike craft, I have to leave them pinned for longer, cluttering up the fleet management area.