What I would wish to see is EW and MW weaponry for, well, EW and MW bases, as well as EW/MW loadouts for ships. Ships early in the war were more loaded out to deal with other ships and not ac, and bases were using mostly rifle caliber guns for field defense if my information is correct.
As for adding .50 cal guns to LW bases, a doozy. Manned .50's I can say yes to, but auto .50's may replace a couple of guns. Of course, replace so that they would equal what is being replaced. It would depend on what type of .50 cal setup you intend to add.
What about manned 20mm's?