I have to say, I would very much love it if campaign mode started you out on an even smaller scale, piloting one fighter sized ship, and with only fuel and 1 crew in your cargo.
Obviously I'm thinking forward in the development a bit, as there would need to be better design and gameplay structure to realistically get anywhere with so humble a beginning. Maybe you'd be able to run cargo from planet to planet while avoiding (or engaging) pirates until you work the cash up for a frigate or more fighter wingman buddies.
Anyway, being able to pilot fighters at any point in the game would be pretty cool, imo, so I would be all for this. Implementation should be as easy as making the AI control the rest of the fighters in a wing and follow the ship the player controls, and when the player's controlled fighter dies, control switches to the next living fighter in the wing.