Pros and cons can't necessarily be copied over automatically because of differences in question scope; e.g. just a moment ago I added a con to yet another Dota entry, here: http://www.slant.co/topics/1082/viewpoints/3#4
The question is good games for office downtime, and the con is very specific to that: if you're in a situation where you might suddenly need to get back to work, deserter status (both real penalties and the sheer rudeness of it) is a far larger concern than otherwise. It would be pointless to blindly copy it into a comparison of mobas; worse than pointless, in fact, because it's a speed bump in reading the more relevant pros and cons. And of course this isn't even a very bad example, just the one I happened to have created myself not half an hour ago!
With all that said, I know that some degree of pro/con "autofill" is in the works, and at a reasonably high priority (IIRC flagging and some comment system improvements are first, but not much else). It will be more along the lines of "This is listed elsewhere with the following pros and cons, please check any that apply to this question." Those would then be copied over, and could be edited to be made even more specific, since they're not actually shared, only duplicated.