When there's a significant time difference between two messages (perhaps a day? or an hour?), I would like a divider that describes the time gap, so as to make reading the chat log easier.
So for example, if we went by hours:
2:59 PM · (ooc) · Foo: hmm
------------------- 5 hours later -------------------
8:05 PM · (ooc) · Foo: yes indeed
... but that might be a PITA on our slower chat rooms. So maybe six hours or a day minimum.