I don't think improving RDM melee would do much for RDM. Any amount of improvement to melee to put it on par with the regular melee jobs would vastly overpower the job to a point of ridiculousness. So there's no real point in improving it a little bit, since it won't ever come close to regular melee anyway.
Personally, I'd like to see improvements in RDM magic done, to make them useful in Abyssea. There was a time when the RDM was king in terms of healing, enhancing, enfeebling, and crowd control. Now a WHM can cover that quite easily in Abyssea, plus has a much larger curing arsenal available. There's pretty much no point in taking a RDM to Abyssea events now, which is a real shame.