Ok. Why for the love of all that is sane, would increasing its range make cure III better? We -ALREADY- have that spell...twice. Medica and Medica II do the job. What would a bigger range on cure III offer us? I cannot disagree with this suggestion more. It doesn't need a range boost, it needs a Usefulness boost. It needs to do something none of the other spells do yet. Some ideas off the top of my exhausted head are..

1: Health based heal buff. I.e. Cast spell on tank, for 2 mins he has buff, if tank hits X% of health, buff goes away and heals tank. A safety net heal of sorts.
2: I shudder to say this because it'd suck almost as much, but lightwell effect? Casting spell plants a graphic on a spot and those who go and tap it get heals. (Honestly I think this suggestion sucks too so..yeah)
3: How about a lower potency than cure 2 but higher than cure 1 spell that also reduces enmity? (Or just..fix enmity)
4: Perhaps a cure that also grants a buff depending on class targeted? BRD get DX or crit, DRG get STR or Crit..etc etc.
5: Long duration regen that works like allagan rot? Can bounce it between folks. Granted the amount of coordination needed to make that useful would be mind boggling but..hey healer hot potato anyone?

Basically please just..anything other than BIGGER MEDICA.