Basara, i think what you are asking for would not be so good.
The goal of this patch was not to nerf anything or to turn people away from those mixed templates. They simply did try to balance some things a bit better, and i bet we will see some more balancing with the next few patches.
Chivalry got a huge buff if you have it at 120 now, if you add it to the list of skills that reduce mana cost, the small nerf some templates did receive at the pvm side would turn into a big buff. Just think about all the bushido archers/throwers , they would get -10 by default, together with 120 chiv it would be ridiculous.
While at the same time doing nothing for mages, tamers or mystics in pvm damage wise, leaving them even more behind.
If you really want to run a pure paladin with full mana discount, you can still do that. Options are lumberjacking, a second weaponskill, or even ninjitsu, i count the last as a defensive skill, and nobody needs to know.
Of course, if you want 4/6 chiv casting + healing, anat,resist,parry, you need to drop something for full discount.