Just uploaded SkullGoBoom. It's a very simple addon to help with assigning raid target marks.
SkullGoBoom is a very simple addon that allows you to easily assign raid target icons to various mobs.
You set a keybind to display the SkullGoBoom bar. When the key bind is pressed a marking bar will be displayed under you cursor and allow you to select the raid icon to set on your current target.
SkullGoBoom also allows you to preset a message that can be displayed in the chat frame to inform your group what the mark assignments are.
Download from http://wow.curse.com/downloads/wow-addons/details/skullgoboom.aspx
Post any bugs here please :)
:| Have a day