The reason OOC posts are not allowed in the IC threads is because they unnecessarily clutter the thread and a thread can quickly descend into not a story, but a collection of chatting posts. These can easily take over a thread and make the story difficult to follow. There are plenty of other ways to discuss a thread other than in the IC. We try to keep them clean to make them easy for you and others to read. For group RPs, it discourages those who may want to join, and for 1x1s, your writing is difficult to follow. You should post your stories with the expectation that others are going to follow along, and it is polite.
Bumping is definitely NOT allowed in IC because it's OOC. It's not allowed in OOC if it is JUST a bump post because it is spam, and because none of our RP sections move fast enough that bumping is needed. Your thread is going to stay on the first page for weeks. IF it falls off the first page and/or is like a week without posts, a bump is okay, but you definitely don't need to make a bump within a day or two of posting anywhere. And even when you do post, just posting bump instead of taking the time to write a full sentence is going to just make you look bad to potential players who might join your game.