Thanks for writing back. -- In playing around a little more with the plug-in, it seems to come on whenever I target a monster.
But, on the positive side of things, the highlighting of mobs is amazing. On Vissidal, I can now see bright flashing lights, telling me to avoid the big debuffers, like golems, remorans, and niffi(ses).
Only got to play around with it for about 10 minutes before my buffs expired and I went to bed, but nevertheless, it was very cool.
A dotted circle around a creature's target would be interesting, although I'm not sure how visible it would be in the situations where it's most useful (for example, Bonecrunch's cave, with a lot of people, you wouldn't be able to see it.) -- But, for other instances, I can still see it being handy.
Ooh, and here's an idea: (Hm... Just came to me, so I'm still thinking of whether it can work or not, but...) How about a hotkey to toggle some sort of information display? Like, I could hold down 'Tab,' and I could have the information in the middle of my screen, for all I care (as long as I could move it around to wherever I chose, at least), and then, as soon as I let go of Tab, it would disappear.
So, that way, useful information that I don't need all the time, is only there when I want to see it (could include best-damage icons/types).
Not sure how feasible that is, and even if it's a good idea, but it could be something interesting.
[On a side note, would it be possible to also show 'next-best' damage, too? For example, as a sword, I don't have access to 'bludgeon,' which is a fairly common one. Same case for axes and 'pierce.' I realize that two icons/words take up even more screen real-estate than one, but that's why some sort of toggle might be handy.]
I realize that making everything completely customizable would be a waste of your time, when you could be adding in more features. And what you choose to add to the plugin in completely at your discretion.

But, I guess that doesn't stop me from throwing out ideas here and there.
[Oh, and to clarify something I mentioned earlier (although might not be as important if you implement an insta-toggle on/off hotkey), was... Perhaps putting some of the info in the actual 'setup' window of the plugin, where you can customize all the options. Perhaps the main tab of it could show a critter's target, and their best-damage, and whatever else there is to show.]
Well, thanks for listening, and, as always, thanks for working to make your plugin even cooler than it already is. I've already gotten so spoiled by seeing mobs running toward me that I've started taking it for granted. I'm going to try disabling it for a minute, and see if it drives me crazy.

-- It's so helpful, especially for things like niffi(ses), that pick up on you from far away, and throw out random debuffs when you don't even realize they've noticed you. Now you at least know which ones to run further away from.
So, anyway, good luck in your continuing adventures of plug-in updating.
Take care,
Jarehan (of Leafcull)