Something like that with the posting every fort night would certainly murder Peebs in terms of the arduous task of tracking posts by date for 300 players. We have to remember that while Peebs is likely to remain for a long time, sooner or later she might leave that post and then finding someone to fill that post would be that much more difficult.
This is another thing that post reset people have become spoiled on, but we used to struggle with filling SoFE at times just like we struggled more recently with filling the GM.
Yeah, sadly I can't think of any ways to fix the validity posting voters that don't involve stupidly high activity requirements (something like 50 posts on 2 months to vote?), making Peebs' job a living hell or both
I do think that "posts on 2 separate months" would not be that much harder to track (every fortnight would be a living hell though), but Peebs' job is already hard enough that people shouldn't make it any harder.