I've only started using Mercurial and tortoisehg within the last few months. I haven't even started complaining yet :) It's only mildly irritating as you just have to hit enter. However, confirmation dialogs are generally pointless exercises IMHO.
Going on 4 months with no fix and no "alternative fix". I fail to see how NOT showing a confirmation dialog is such a major deal - it's low hanging fruit/broken windows level. Be amused about the hgtk client which we're obviously not using.