Holding down the left mouse button in minecraft works for me? It auto-repeats?
I don't know if they changed it, I haven't played since a few versions before the official release.
[Edit:] Now that I think about it, it wasn't mining, it was farming monsters that caused my siblings to rapid-click repeatedly. IIRC, at least while still in beta, you couldn't hold the mouse button down for swinging the sword. So I guess the designers can have half their twinkie back.