In vBulletin, I frequently used the ?do=getnew and ?do=getdaily parameters in my searches to grab the most recent content. With vBulletin, there was an&include=ids,separated,with,comma and an &exclude=ids,separated,with,comma parameter which (obviously) included only the IDs specified or excluded the IDs specified. This helped me filter between the forums I had no interest in and the forums I do have an interest in.
I'd like the same functionality available in XF (if it's not here already)