Infraction: 8. All accounts must have a valid WoW profile.
Message to User:
If you have three 80's to tank with and some hunter questions, then surely you can link at least one of your characters in your profile.
It is possible to set a target's icon via a macro, but not to target a target by its icon. Your best bet (if you're having trouble doing it yourself) is depending on someone on a tank list such as the one provided by CTRaid, oRA, or other mods.
I can actually mark very quickly (comes from having 3 80 tank alts, and be very organized ;-) But in some of the Uldaman fights there is can be a ton of mobs up and it would be helpful for people to be able to quickly macro-target a mob that has had a skull-mark placed on it, when the marking person is forced to switch targets quickly after marking the mob with a skull. Oh well - thanks for your input.