So, one day a student of mine posted (!), wondering if there were any group settings that would arrange posts in reverse chronological order, presumably to save some time. That post caught my attention and eventually, I decided to prepare a bookmarklet for this exact purpose. It was pretty much straightforward but unfortunately, it would only work for groups. Someone may find it worthwhile to adapt it to the home/profile feeds, though.
Update: It seems the student got interested in this sort of JS magic and she actually took it a step further to work for the home feed as well.
Update 8/23/2013: Drag this link if you want to sort ascendingly Repairo-Feed!
Update 3/23/2014: flist is not at the root container anymore; so we added another .children and all is fine. (Many thanks to Jeff E)