In TOS the Romulans were hell bent to capture a Federation Starship alive (EP: The Enterpirse Incident) so it would make sense and there is a Klink mission where you steal a Fed Runamok...erm, Runabout. I think it would be a good idea with certain limits. What those limits are I can't quite put into words yet.
Some of the best Fan Fiction I've ever come across for Star Trek was a group of Ex Starfleet Officers buying a ruined hulk of a Romulan Winged Defender, fixing it up with Fed and Klingon tech and setting about the galaxy as a group of guns and cargo space for hire. Why not get some of that in STO?