Ever tried to do something in creative mode and keep having issues where you would break a block, and accidentally hit the one behind it too? It would be kind of nice to have some sort of toggleable delay on block breaking. When it's turned off you'd break blocks like you normally do in creative mode. But when turned on, it would take about the time it takes to break a dirt block with your bare hands to break any given block (and you would, naturally, see the cracks). This would be really helpful for doing precision work in creative mode, and probably wouldn't be all that difficult to add (as every block would have the same delay).
Praise be to Spode.