The progress wasn't going very well, but now I decided to finish what I've started. I plan to release a "Beta" soon, with that's done: everything but the custom Synergy bonuses and custom Runes.
There're still a long way to go, but the mod is playing nicely. I still have to test it a bit more, but it is playable as it is.
As your level will be almost the double at it would be in the "normal game", I've halved the amount of HP/Stamina/Mana you get per level, and you now just get 3 stat points per level.
It won't make much difference... so in my mod, a level 11 Character would have nearly the same amount of stat points as a level 6 character, but with much more skill points, also, without needing to spent skillpoints to follow skilltrees, and that's enough to make it more fun.
Thanks, expect a release soon.