I noticed a couple wierd things:

1) Charm Weapon is what I used to add charms to my boots and ring... There wasnt another charm skill for non-weapons, but it seemed to work.

2) not only did it add the stat coresponding to "minor dexterity bonus" but it also gave me ring and boots a "reduction: 5" attribute (I think it was called)
Normally only weapons have use reduction, I thought, so what does this mean on non-weapons?