Two additional capabilities that I think Roadster (Rocket Augment) could have

[u/Intro24]

I'm not gonna say these are particularly practical but it seems to me like they could work:

1. Actual controlled flight - Car accelerates without thrusters, gets up to speed, then adjusts the aero so downforce tapers off and it starts to generate lift. Active aero and thrusters stabilize it once it leaves the ground. Basically this but stabilized by active aero and thrusters. In this scenario, thrusters don't need to launch the car against gravity or break its fall, so I think it could sustain this for a good amount of time. It might even be able to do it indefinitely if the thrusters can continuously recharge as they simultaneously make small adjustments. I would expect that this could only be straight-line flight near the ground but it could maybe control pitch/roll/yaw to some extent. This would be real flight because the car itself would be generating lift. Obviously this would be super illegal and dangerous, I'm just saying it seems like it would be possible.

2. Vertical wall ascent - The first demo they showed required a custom-built ramp that the car could smoothly drive up. I don't think a ramp is strictly necessary, though. Imagine if the car drove up to a wall and then yeeted itself into the air, repositioning itself so it was pointing up at the sky, and then hovering briefly while slowly maneuvering itself against the wall. At that point, the fan would kick in and create suction to keep the car in place like in the demo. Now the thrusters are no longer needed and the car is planted firmly on the wall. The car can then drive up the wall while the thrusters recharge. Once it has traversed up the wall, it can do the whole maneuver in reverse to dismount and land back on a horizontal surface. Essentially, the car would be able to scale a skyscraper in this way. Again, obviously super illegal and dangerous but it seems technically possible.

I think both of the ideas above would be possible to pull off under full manual control. It would be similar to playing Elite: Dangerous with flight assist off if anyone is familiar with that game. Manual control makes it even more unsafe, but the driver of the rocket augmented version is basically a test pilot anyway and it would be cool to see a stunt driver like Ken Block (RIP) in full control and showing off the craziest things that the car can do. Also, manual control of the thrusters would be in keeping with their "Last Best Driver's Car" tagline for the car.

[u/Joker_Da_Man]

The fans could conceivably provide enough thrust to sustain forward flight. Maybe. I don't think sucking from the bottom would be good though... alternative intakes?

Are there thrusters pointing "up"? These would be necessary to move the car in towards the wall.

[u/mamahler]

Reverse the direction of the suction fans maybe? Could create a cushion of air to help it stay airborne.