No they wouldn't, why do they need to know when the latest they can post is? They can post whenever they like, like they can now - it would be exactly the same for everybody as it is now. It would just be that instead of posting a set deadline the organizer would post when the matches are supposed to start and it would be the responsibility of everybody to try and post before that time, just like it is now.
Try it with the next set of matches, you'll see it will be fine.
No we run this week with the existing rules and don't change the middle of the week. You also wait until we can get Grabcopy and Allan's opinions as well as the other organisers and then we see about changing.
Sometime's changes are necessary and I don't see how this one is. I will go with what the majority decide but I don't agree with changing the rules mid tournament and without having heard what the other two think.