I'd love a slightly tweaked Raptor with a Universal Ensign.
It would allow us to configure like a Fleet Escort or a Advanced Escort in a Raptor still.
As for special abilities, How about a console that allows you to improve your Ramming Ability and use it without being low on health. Like the old days or is my memory off and you always needed to have 50% health to ram.
I remember a Fed saying with his RSP and FBP he was untouchable, que Torpedo Spam and the whole Klingon Side Ramming his ship. Strangely enough those abilites don't help vs the Kinetic Damage of say a whole ship hitting you.
Why ask for a t5.5 Raptor when the free regular t5 variant is already on par with the cstore Defiant-R?
Jokey answer: Cos KDF do it better! hehe
Seriously though, the KDF should have its own LG Raptor with some bells and whistles the same as the UFP currently has in the Defiant-R (broken treaty anyone? or just taking a cannon to the cannon) or the MVAM. Now, I am not suggesting for one minute that we get MVAM. I would however like to see some sort of cool/special ability! (I would prob be happy with the Battle Cloak, but I'm sure they can come up with something better!)
And as for the Nausician ship, I don't see why I should be limited to it! UFP have two ships to choose from at this level, so should we, besides having to stop for 3 seconds to fire a weapon that by the accounts that I have read the galaxy-X can fire on the move doesn't sound too appealing to me.
Seriously though, the KDF should have its own LG Raptor with some bells and whistles the same as the UFP currently has in the Defiant-R
The Defiant-R already loses 3/4 of the Crew and a console slot (or cloak) for a gain in maneuverability compared to the regular Raptor. I don't really see where a cstore raptor would fit into this. Maybe remove cloak from the regular Raptor and switch the ensign to universal to make the regular one the AE / FE counterpart. The current Raptor would then be your t5.5 variant, like now or possibly with better turning by the price of cloak being a console.
However due to the new fed escort(s) in development, I would agree that klingons could also use some more diversification in their endgame escort branch. But this should not be a buffed Raptor, but a completely new, independent, ship, balanced against it's fed counterpart.