A very small (10kb memory usage) add-on for fast raid icon assignment. Push alt and move the mouse over the mobs you want to mark. Thats all.

It will assign the 8 icons as long as you hold alt. To mark a 9th mob you have to reset it. To reset the add-on just press shift once. This will not reset the current icon assignment, as long you don't begin to mark mobs once again with alt + mouseover. There is no logic for crowd control, it will simply mark the mobs. There is no config window and no slash command.

If you are looking for an add-on with marking logic (for cc) you should try http://wow.curse.com/downloads/wow-addons/details/magic-marker.aspx Magic marker. I used this one also for some time but for my needs it uses way too much memory but its a great add-on.