Normally when a character uses armor or shields that the PC is not proficient with he suffers the armorcheck penalty from his rolls. However what happens in ToEE with equipment like the wooden elvish shield that has a armorcheck penalty of 0 and arcane spellfailure of 0? Can a non-proficient PC use that without any penalty? Could my Sorceror simply use it and in ToEE suffer no consequences? Or is there a penalty that I can´t see?