Hm. I do believe I said "end of thread", didn't I?
Anyway, it's not like we're talking about a feature that changes gameplay, affects mechanics in any significant way or requires a heavy modification of the engine. It's simply pushing the XP slider at the start. It would require testing, but really... how much testing would it really take to see if a feature that is applied at the very beginning and does not affect the rest of the game at all works? Okay, I exaggerated before. Make that thirty seconds. It's possible that a few problems could arise if there are scripted, reward-only skills or similar, but simply disable those/make the bonus redundant and you're good to go.
At any rate, this is irrelevant (and speculative, so I'm going to shut up), as any efforts invested on this are pretty much wasted - cheats can achieve for the player the exact same result. This game does not have a MP component where you can benefit from grinding in SP, so what's the point anyway?