I like the idea of adding En-element/Spikes as long as it is an inherent part of the avatar and not dependent on using a JA. The idea of avatars absorbing like elements (Titan absorbing Stone magic, for example) would also be great, even better if this were an aura effect for fellow party members.
I'm still a bit leery of this new ability to shorten BP timers, but Camate's description sounds like the developers are going in a reasonable direction. I'm also glad that they are looking into addressing the issue of Summoners not having access to every Staff weapon skill. There really isn't much logic to White Mages having exclusive native access to Cataclysm when Staff isn't even their best Weapon (Same issue could also apply to Hexa Strike, but that's a WHM-PLD issue).