Good idea, but from what I understand... They can't change the mechanics of mining and quarrying. Something that has been asked a few times is once you become opt at mining/quarring, say bronze/sandstone, that we hit for 7-20 instead of 1-20. Devs said this change wasn't possible.
Personally, I find it troubling to have a skill of 1400 quarrying/mining and hit sandstone/bronze for 1, 1, 5, 3, 19, 1, 2, 1, 5, 7, 14, 8, 4
I don't see them being able to implement and adjust this bonus system you speak of. Although I like it