I would not like to see Paragons be universally applied on all characters; I prefer to advance them as I like, taking time to play each class, gain insight about it and learn how different builds work. I would like to have a feeling of advancement as I play each class.
Still, getting extra benefits from paragons is a good thing. Maybe those credit mentioned above could be used to apply small improvements to skills, even multiple times, for example:
* X credits to permanently increase damage of a skill by 1%
* Y credits to permanently decrease the cooldown of a skill by 1%
* Z credits to permanently decrease the resource cost of a skill by 1%
Or, every skill can have a specific aspect improved for an amount of credits, like the way item bonuses affect the skills (damage for Spectral Blades, arcane cost for Disintegrate, duration for Blizzard, etc).
There should be of course a cap for such improvements, lets say no more than 10% improvement over the original value.
With this system, players could invest their points/credits/whatever to the skill they like and make less used skills more powerful, or specialize in a specific skill. Perhaps this would limit the hero though, while in the current system every hero can use every build.
I would not like it if new special abilities were unlocked on runes, as it would radically affect the balance of the game and may force players to only unlock specific runes, limiting variety instead of increasing it.
Edited by NYARLATHOTEP#2116 on 30/07/2013 16:52 BST