I recently had a thought, dunno if it's even possible, or if it would be desirable, but...
What if in addition to the Recent Forum posts on the main page there was also a section for Recent Forum Posts for the server you currently have set. I'm sure most server sub forum posts get pretty quickly knocked off the main page, and for some servers there may not be a whole lot of conversation in them to begin with (cough, Carbuncle, cough). So it might be nice to have them there on the home page so you don't have to periodically check the sub forum on the rare off chance something that interests you might have missed your attention on the home page.