iirc the recent articles tab on the home page has no concept of mutliple journals, and shares a single cache, so it cannot be used on more than one journal (we are hand-coding it on the other journals currently)
to truly be useful for the other journals, we need some per-journal configuration settings:
-configurable definition of "recent". plosone uses 1 week, but journals with a slower rate of publication might want articles from the past month.
-configurable number of articles in the block. iirc, plosone is 5, but slower journals might want 2 or 3.