Subtarget commands in ARR - Simple Questions

[Niwashi]

Then, how can I obtain a similar effect? What I want do is being able to target something and keep that as my target (an NPC, a player, most likely an enemy target) and then press a cure macro that, after pressed, will allow me to cycle through possible eligible targets before the spell goes off, and without removing my current main target.

That way I would be able, for instance, to keep casting offensive spells on an enemy, and at the same time heal my party without having to target them first.

Why a cure macro and not just the Cure skill? Subtargeting still works for regular skill use.