I had noticed that the shield wasn't protecting allies and bomber drones under it
It should be protecting the drones at least, and I think it also protects the allied minor faction units (at least it did in my tests, I could take fire in the place of a EEr starbase if I wanted to).
or knocking enemies aside
It's intentional that they don't do that, like the spire capital ship shields don't do that. The fact that the Riot's shields
do is one of their special features. I think those are the only highly-mobile (as opposed to glacially-mobile) "pushing shields" in the game.
Why would it be hard to have scaled up versions of already unlocked turrets? I was thinking that the reward would just let you have versions of the small modules in a medium slot with increased salvo size or damage.
Oh, wait. Probably sounded like I meant having multiple, actually separate turrets in the medium slots for the weapons bank rather than just scaled up ones, didn't I?
I did think you meant the latter. It would be possible to define bigger versions of the smaller modules for use in the larger slots, but honestly I'd rather not. I'd rather have disjoint sets for variety of loadout, etc.