http://www.dual-boxing.com/wiki/inde..._Macro_Goodies

/click LFDRoleCheckPopupAcceptButton
/click LFDDungeonReadyDialogEnterDungeonButton
/run LFGTeleport(IsInLFGDungeon())

This macro accepts your current role in the new Dungeon Finder Tool and confirms the "ready check". The last line will port you into or out of your random dungeon {beyond the autoport from the Ready Check}.