i am sure you have some nostalgic feelings with RDD, but please remember RDD PrC was always a Noob Trap. They never was great, even on OC or Motb. 10 lvl RDD are Nobbuilds, even in Original Campaign. You can search at DB and you wont fnd any Power Build with 10 RDD. Some EDM Builds has 4 RDD Dip. Class itself brings mostly Ability Points like Heartwarder and has same low use. In a World where you easily hit now 2 Ability Caps, Ability Points from PrC are definitv minor targets.
I think Devstaffs To Do List is long, so my Opinion is, RDD has very low Priority. Even high BAB wouldnt make that PrC much better and 1/2 Spellcasting Progression wouldnt help that Class much too. Just spread a few Abilty Points over this World.
Sry Buddy, would like to see some more important Stuff before!