Oh, haha -- great point. I'll make the repair stations non-repairable but with a health recharge, like the force fields, etc.
Last night I had a hell of a situation.
Early on, I had a fleet of Mark I cruisers trying to kill a Special Forces station. I would fire a salvo, then a fleet of Mk III engineers would repair all my damage before the next salvo, and I couldn't kill the engineers since they cloaked.
Annoying AI! I knew what my next ship upgrade was, at least.
Cheers,
Doug