I would guess the current change in message when Ajax Wacking is to ensure the button moves when you're going too fast.

A vast majority of people hit the space bar to get around this and thus the button moving or not moving is of no concern to them.

I suggest this is stopped and the space bar can no longer be use to trigger the AJAX Wack button. Alternatively, stop the button moving all together. Either would be fine.

When this was discussed in DL, Izzy did say he was going to disable the space bar for that screen.

Ah excellent. I don't attend #DL so the update is appreciated.