SenseiMatty said: Yes, in fact rocks fall much slower on low-G planets. Dust is much lighter so the jet blast should send it much higher thank rocks with consequent longer time to fall back to the ground. Click to expand...

No, the dust will fall at exactly the same speed as the rocks, the higher it's blown off the ground the faster it will fall. The moment thrust is shut down the immediate area of the ship will be clear of dust, basic physics. A piece of dust a nanometre across will fall at the same speed as a rock weighing 1 ton. Surface dust blown away at an angle from the ships thrusters will follow a parabolic pathfrom the ship until it hits the ground. Sorry there will be no dust clouds hanging around the ship in an airless environment, this makes no sense in physics.