I've thought of it, and I was wondering: how about Electronic Warfrare based and a Shields Support ships being a choice in the roster of vessels?
Electronic Warfare vessel
This particular craft could launch AoE or Aimed disruptive attacks on enemy groups or single ships.
It's abilities may range from slowing/arresting a target to prevent it from firing or detect hostiles.
Shield Support vessel
For this one: not only it may regen allied ships' s shield(drain enemies 's?), but even project a large screen (for a short time,and be static during it) to protect from incoming massive barrages of fire.
One of these two ships may have an ability that confuses incoming missiles targeting systems, causing them to deviate and crash elsewhere.
These are few ideas I had. What do you think?
Tell us of your own ideas and concepts! :D