I say no to this but I suggest just make the cost of retreat less than the cost of death. In terms of time. Plus when a battleship bites it they spend over a mill to re equip anyway.
If you want caps to pay even more than I suggest give the capital ships more bots and bats and let them regen more than Fighters/bombers and thus if they die they pay much more in terms of bots and bats.
Side note: Isnt it strange that a fighter/bomber can regen more than something with a damage control crew?