Remove perma crits for blus, remove random crits for reds, and allow for blus to re-warden if a warden has died.
MFK would be harder, accidental freekills would be harder, BLU teamkilling would be harder, freerounds would be so much harder to achieve, and the actual game of jailbreak would continue to last throughout (if there's component blus). Overall, BLUs would remain in control for the vast majority of rounds without the cause of some random engineer crit killing their warden without having them be too overpowered.
MFK would be harder, accidental freekills would be harder, BLU teamkilling would be harder, freerounds would be so much harder to achieve, and the actual game of jailbreak would continue to last throughout (if there's component blus). Overall, BLUs would remain in control for the vast majority of rounds without the cause of some random engineer crit killing their warden without having them be too overpowered.