i don't really wanna fight mobs with a set of actions set in a stone. more like randoms actions and pre-determined action to a certain % of live, as always been.
#1 is the established solution in many MMOs. The target gives a visual cue, like an animation, or a line of text (the former being the better choice, as you don't need to keep an eye on the chat window).
this work if the action is a insta-kill or can be avoided in some way. In ffxi we had stun for that, in ffxiv nothing like that (speaking with boss fightes in mind).
In a normal battle we already have a certain degree of advice for skills, like the casting efect, teleports ecc, that is enought