One thing I noticed from the beta: When you jump off the sparrow, your character carries forward momentum a bit further than the sparrow does. So if you jump off and want to instantly jump back on, you have to backtrack a bit. Please adjust the sparrow to move forward a bit more when you jump off to be more inline with the character or ahead of it.
Get on a skateboard and jump off it to your front. It will be left behind. It's normal physics. If you jump from the Sparrow to the right it stays at your side. I personally liked the physics involved in that detail.