I don't see why not. To be honest, I've wondered myself why SMWC doesn't have a feature like this already. Personally, I'd extend it to also include comments on News posts as well (even though News comments are obsolete now).
That said, the actual benefit of this seems small, so I imagine the site's coders will have a few words to say about how much effort something like this would take to implement, and whether or not this idea is really worth it.
Sparkster - Steel Works (Note: I've got an exam this week, so my porting progress won't be as speedy as it used to be.)