Big Yes !
However, if you do decide do something like this, I don't think you need a block that provides lift. Rockets already do that :D. More importantly, since I read somewhere that you're planning to add drag, why don't you just add a block that creates air resistance? That way, you can create aircraft, but also manipulate drag in other ways.
Lift isn't necessary just an upwards force... It's a simulation of air friction, or a faking of said simulation. Drag and Lift go hand in hand. Plus they'd add extensive realism should Mark pull it off.
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