It would fly around (cumbersomely) and shoot at stuff.Are the rebels lacking ships that fly around cumbersomely and shoot at stuff?
No they're not; but they don't look as cool as the Lambda does.
The way the game's set up means you couldn't have a title that converts an Imperial Lambda to a Rebel one (not saying FFG couldn't work around that though.) However, that would also give the Rebels access to Captain Yorr, Captain Kagi and Colonel Jendon.
I'll acknowledge that. It would take more than a simple title card to engineer. But, as you said, if FFG wanted to do it, they could figure out a way.
I wonder what we're really arguing about here, though. There's the thematic vs. 'design space' argument. I tend to stick up for the thematic side of things. I realize that the Tyderium did not fight in combat, so that's a thematic drawback, but with so much else about this game, that Rubicon has already been crossed. I don't take the design space argument in this debate as seriously, because I don't see any harm in redundancy. Sure, I suppose that there's an opportunity cost. If they're re-occupying this design space, then they're not developing another. But, so what?