I wouldn't recommend it. IMO, you should only use macros for raises and oGCD abilities.

Also, for the "AoE heal get close!" warning to have any noticeable effect, you'd have to use a wait command for the text to appear before the actual heal. The problem with that is that if the delay is too long, it risks getting people killed. If people are sharp enough to react to a short delay, did they really need a warning to begin with? Just my 2 cents.