I reject the idea of joining a campaign (which I haven't done yet) that would require me to post a certain number of posts per day - mostly because I usually don't post much (depends on the time of the year) - or to post in sections of the forum that do not interest me at all (like Games and Rounds*).
You don't have to worry about that. Signature campaigns generally don't count posts made in Games and Rounds.
You will be required to post in Gambling and Gambling Discussion though. But yeah, I understand what you are saying.
3. If there be need to limit number of posts per day, the system should be programmed to also accept the posts, queue them in and maybe publish them the next day. Then, to what essence?
I don't see that ever happening. Imagine that you need some urgent help today and that has to be in the next 5-6 hours. But the two people who can help you can no longer post because they reached their daily quota. They could PM you, but let's say you/they don't want that. The forum (actually theymos) isn't going to limit people in that way.
Will they be comprehensive, different and not copy/paste from somewhere else? I kinda doubt it. So doing this could get you into troubles, so you better not attempt it
AIs don't copy-paste. Especially not those produced in Switzerland.