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What do you think of adding new "Sort by" value called "comments" which would, when clicked on, sort questions by most (or least on second click) recently posted comments in them? This shouldn't change current behavior of sorting by activity.

It could also be mixed with solution @sagarun proposed, which would then serve as a mechanism for admins to choose whether sort by activity or comments would be site default. Option can be added in user profile too to change this setting on individual basis.