It wasn't until long after the first time I encountered doom that I realized that you don't see other people's doom countdown messages. You can call me whatever names you want for failing to notice this the very first time I ever ran into doom (a long time ago), but it made me realize that in many other games with doom effects, including the FF Tactics games and the Crystal Chronicles games, doom countdowns are displayed on the affected characters, which count down when their turn comes up (tactics) or in real time, even in multiplayer (FFCC).
Since we already have the ability to put damage numbers over character's heads, wouldn't it be nice if doom counters were visible in FFXI? I realized after that initial discovery that the reason for the lack of log messages for other players is simply because of the massive spam that would ensue. But an onscreen display would work just fine and wouldn't have that problem. I'm willing to bet Camate or another staff member will come in and say "This is too hard to implement" but figured I'd post it anyway. It would be a great help if you're attempting to remove doom from someone else.