I tried "Gregs" numbering thing, and it didn't work. The comment numbers did not display.
In fact, it changed the avatar/picture in the comments to the "G" logo on all comments (even those with pictures). And the "G" stayed there even after uninstalling the add-in! Wasn't very pleased about that.
I suspect that I am better off modifying the comment php code with my own little subroutine and styles. And then remembering to reinstall that change during any future theme upgrades.
It would be nice to have a 'insert code/css before comment code block' in the theme, though. Or a checkbox to enable comment number display, and some CSS to specify for that area if 'checkboxed'.
Great theme, though. I really like the ability to customize just about anything.