Personally, I dont think it's a half bad idea. I know on old jail, we were only allowed 1 warday per map. I think it would be best to only allow one type of freeday per map.
I.E.
If you play 12 rounds on a map, you'll be able to call a war day on the forth round. On the eight round, you'll be able to call another one, but it can't be a warday.
But, following Legend's statement, this would be Quality of Life change that would have to be on hold, and way down on the list, to allow tech team to catch up.