Really the only thing healers want is to have something to do with the time they aren't healing, which is a lot of time. With the current design of the game DPS is the only option to fill down time for them and their kit has only two DPS abilities, some have more that are both DPS and healing abilities but they are used nearly exclusively for their DPS potential because there are a plethora of other healing abilities they have available to use if needed. I have always been wanted more support abilities for healers, fill their downtime with buffing party members or debuffing enemies, but the dev team seems to be deathly afraid of any meaningful buffs or support abilities. Even the flat percentage DPS buffs that most jobs have are hardly felt during actual game-play, you need a parser to actually dig out the number differences and notice them. I'm sure people will point out that I do not participate in Savage or ultimate, which maybe these kinds of buffs are felt more, but you shouldn't have to be in the highest tier content to feel like your job is having an impact.