I think the ID of a fast craft could work, but more as a Rapid-Response/Scout Vessel. Rather than have lickety speed, it could have special functions such as a short cruise engine time and a long-thrust. I'd also say they be lightly armed and armoured, and not able to CD, otherwise they'de be too powerful. Couple of class 8 guns, and you've got yourself a ship to scout ahead, or ships that can rapidly reach another destination ahead of another group. Say the Rogues in Liberty, I dunno, launch an Assault on a Carrier traveling through Manhattan. Someone deploys the Scouts, and they head on, find out about the size of the enemy deployment, and engaged high-priority small-targets, such as Bombers.
Of course, I have no idea what I'm talking about, kinda nulling my point.