NCC 1701 USS Enterprise

[McAvoy]

Not outside the realm of possibility since they do in fact close off hull breaches or shuttle bays with forcefields. Maybe having something as large as a shield bubble is harmful but small forcefields are OK since they only cover a small area?

[Graham Kennedy]

My guess would be that a Starship could modify a shield bubble around the ship to contain an atmosphere, but the issue would be that you have the shields up all the time, 24/7. I doubt a ship could do that for more than a few days.

[AlexMcpherson79]

Even if they could afford the shield power requirements 24/7, why spend all that power and the attendant necessity of other life support systems, only to endanger anyone 'outside' when you get into a random fight with a Gorn?

and since they DONT have shields up all the time except for transporters/whatever, then they probably can't run them 24/7... though this is not definitive proof, merely "known facts fit within the theory, but are not true supportive evidence".

[bladela]

it could be convenient for repairing the hull, simply coming out with magnetic boots but without all the environmental suit.

It is also true that a damaged ship could be the one with the least energy reserves to use for this.