Lock Brush to X Z Y axes if you press and hold it while sculpting

What if you could define the direction you're sculpting if you pressed X Z or Y after the first click?

Imagine you're using the drag brush, then you wanted it to move just horizontally. You could start dragging, press X and it would behave like on Edit Mode. It could work the same for the other brushes.

Since it would only work after the first click it wouldn't have to interfere with the current shortcuts.