RDM has so many processes that would Dualcast be the best option to add to the job gauge? Ok yes it becomes available from an early level (compared to things like Verfire Ready and Enhanced Scatter etc) but it's not like Dualcast is actually active for very long anyway when you compare that to Hotshot and Straight Shot which really did benefit being added to their job gauges.

I do find the RDM gauge a little basic though and wouldn't mind something more appealing so any addition could give it some life.