Basically treats takeback offers in a similar vein as draw offers. A few concrete benefits of doing it this way:

• If you request a takeback, you aren't then required to wait (with your clock running down) to see if your opponent will grant it.
• If player B makes a mistake, player A might offer a takeback and then play the move that punishes it (to show B why it was a mistake). However, currently this cancels the takeback offer.