
MapTool does this.
When you have a token selected, pressing the arrow keys with will move the token, the "D" key will "drop" the token (which is less intuitive, perhaps, than it could be), and Escape will reset the movement to the starting position (which is not relevant to Roll20 as long as it doesn't display move paths... which it should!)
I suggest Roll20 should have the arrow keys move a selected token, at least.
When you have a token selected, pressing the arrow keys with will move the token, the "D" key will "drop" the token (which is less intuitive, perhaps, than it could be), and Escape will reset the movement to the starting position (which is not relevant to Roll20 as long as it doesn't display move paths... which it should!)
I suggest Roll20 should have the arrow keys move a selected token, at least.