Mark Main target macro

[lllBlackSunlll]

is there a way via macros to make it so i only have to click a button to put skull on a target, figured it would be alot easier for tanking since with all the heroic chaining i've been doing.

[Taryble]

Honestly, you can keybind all the marks. On my priest, I've got all the marks keybound to my numpad. On my pally, that's where my seals are, so I need to find somewhere else to bind them. Heh

[destada]

This should help:
http://www.wowwiki.com/Raid_target_icons

[Bananengurke]

/script SetRaidTarget("target", 8)

change the 8 to another number for other icons

as a tank I have Taunt on Shift+Q, and Skull on Shift+MouseWheelUP, Cross on Shift+MouseWheelDown, so whenever I taunt I also do the right scrolling and its marked

the rest is on F12-F5 for out of combat marking, no need for an addon

[Abolishment]

Touching on what Taryble said, you can actually go into your Key Bindings interface and select the raid marker keys from there if you're looking for some kind of constant marker system.

If it's something like placing a Skull on an enemy when you use CC on them, then use the /script command in Bananengurke's post.