You should be able to post anything in here. I do not believe there are any restrictions placed on this section.
Readers can post a thread about a book their reading at any time, and comment upon it. There is a chosen book club book that we start at the beginning of every month. Those books are chosen from a random selection of recommended reading. I may even change that after the current selection are read, as many who made recommendations then disappeared and didn't really continue to participate in reading books. IMHO, I think it is more fair that randomised selection is from people who are actually participating versus people who just want to put in their two cents and then disappear.
End of the day though, we have the next three books selected.
Again though, if you don't want to recommend a book for book club, and instead are planning on reading it soon, you can just post a new thread with the book, then provide your comments on it afterwards. That allows others to choose if they want to read it as general reading.
I'm sure lots of read books outside the one monthly book club one. I know I do... some months I have read 10+.