2 10 Jan 2015 06:46
I think there is not such a plugin to do that.
Furthermore, when you said "allow the user", do you mean the administrator or any visitor? In the first case, I have seen another post from you commenting the parameters "Post/Days per page" and "Comments/Page", however I'm linking the manual pages here for future reference: http://b2evolution.net/man/item-list-features and http://b2evolution.net/man/comment-viewing-options
Can you explain a bit more what do you have in mind? Would you like to suggest a feature on this subject?