My server uses mchatsuite, I have a specific, unique login and log out message:
event:
join: ' &a+&r %player'
leave: ' &c-&r %player'

Your plugin doesn't actually have that functionality though, it just makes my name like the plain white color.

My logins will give the name, and rank color as marked in the mchat info.yml

I would like you to add functionality like that, either to use mchat variables, or, you could fix my plugin another way by making a variable for the TabList name. (Player.getListName()), or, if you don't mind doing something just for me, you could enable it to be like this:
player.getPlayerListName().substring(0, 2) + player.getName(), this way it just gets the color code, and gives the player a full name. Then it would like exactly like my logins and log outs. :)

Do you know if it sets the displayname (within bukkit) on the player? VNP supports getting that by using %d instead of %p for player name

Sorry, I don't believe it does that. If it does, I searched, and didn't find a way to do it. So your %d won't work. :/

That's silly. I'll consider implementing Vault support.

(Vault support was added)