Heh, more freighters would be cool. Some with a semi-generic flat surface for large containers to dock to on the bottom of the ship.
Though on one GTVI mission I experimented with, if you disabled an enemy fighter a support ship would fly in, dock with it, then take it off. The whole purpose of the mission was to supply command with other shivan fighters so they could be examined and possibly converted for Terran/Vasudan use. (Like when Alpha one goes off to shivan space for the raid on the comm nodes in Mara's).
I used support ships instead of freighters because a support ship can cruise at 70 instead of the 25-35 of a poisedon. That and they aren't armed, so they don't shoot up other fighters you're trying to grab.
So maybe a freighter with a fighter docking or cruiser docking facility would be better.
But tractor beams for larger ships would be much better. Have a disabled destroyer towed out by a dozen tugs instead.