I have an idea for a new ship classification- in fact, I haven't seen anything like it anywhere, and I don't even know what to call it. Nevertheless, I will attempt to explain the basics now, and follow up with more as it comes to me.
As you all know, fighters can fly inside shields. Now, what happens if you create a unit(with a model of, say, a Terran Navbuoy) and give it a BIG shield. Not a super-strong shield, but a big one- maybe 400-600 meters wide. Fighters could fly in and out at will, and could fire their weapons from inside out...but not outside in.
If this works, it could add a whole new element to the game. If the GTVA wants to give fighters the ability to defend a very localized region of space, or even just to protect a few cargo containers, they could deploy one of these. It would be sort of like a bunker or foxhole, providing cover to those inside. The shield could be beaten down without too much effort, but the time that would take would allow the fighters inside a considerable advantage. Or, the outside fighters could just fly inside.
Think about it. Then tell me about it. If this HAS been done before, do tell...and then excuse me while I yank my foot out my gullet.

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