I don't see how typing "c Fn+t d Fn+r" is faster.

About accuracy, I have commented that probably a way to solve this is:

1. One tap highlights the piece to move.
-- If the tap went to the wrong piece just tap again.
2. Next tap highlights the aimed square.
-- "ok" style highlight (e.g. blue) if the move is legal
-- "wrong" style highlight (e.g. red) if the move is ilegal
-- if the tap went to the wrong square just tap again
3. Next tap moves the piece to the desired square.

Easier done than said. Comments?