RDM is really fun right now and I would love to see it stay mostly the same. On my wishlist for new skills in Endwalker is upgrades to both Acceleration and Embolden thru traits. Acceleration could function like Ninja Kassatsu increasing the potency of our spells and changing them into more powerful versions. We would use it the same way but get more damage and flashy animations to punctuate our rotation without adding buttons.
I would love to see Embolden get extended to a 25 second duration with damage drop off every 5 seconds and two additional effects:
-Reduce the mana cost of Enchanted weapon skills by half. (Allowing us to do the melee combo twice in a row before running dry.)
-Guarantee that Ver Holy and Ver Flare always have 100% proc rates for Ver Stone and Ver Fire
The idea with this would be that Embolden would allow us to use both VerHoly and Verflare in succession to gain both the procs with a new skill that replaces Scorch when both procs are present. Lets call it Scorch 2 since Im lame on 120 second cooldown just like Embolden. So the melee combo stays the same and mana generation rate too but we get to do a longer combo with a new more powerful Scorch and no extra buttons.
I would like Enchanted Moulinete to consume all Mana when used so we stop spamming it and get a bigger animation when our mana bar is completely full. Something flashy that lingers and feels impactful cause it loses it's bite when you see it used repeatedly.
Everything else I want has been mentioned already.