the functionality is fairly simple -
if you equip a shield and sheath it than the shield replaces the quiver.
once u draw the weapons the quiver is either stil missing or pop up again (though i think it's better if it will remain off).
when you switch back to bow and arrow the quiver re-appears.
more elaborate settings would be that if u switch from a shield to a 2H weapon than since the shield was last used he will be placed on back along with the 2H weapon. if you use a bow than the quiver will appear and if u switch from a bow to a 2H weapon then the quiver will remain.
The shield on back mod from oblivion was really cool. it just doesnt make sense to carry a shield on your hand when you just run and walk around. these things weight about 15 pounds....
anyone thinks he might pick up the gauntlet?