As goes for melee, I would like to see a native Double Attack trait (maybe...) and an enspell that is actually effected by MAB AND Enhancing Skill. Making the weapon actually glow (like Sarasinger) during this effect would look cool XP. More importantly, vorpal blade without having to sub a certain job would make meleeing more enjoyable...
Maybe that isn't what RDM actually NEEDS but it is something I would like to see lol
Edit: The Double Attack could come from Enspell t3. "Composure: Grants Double Attack." When casting it under the effect of composure (who wouldn't...) you get double attack. XD