1-1/4 in. x 8 ft. Quicksilver Metal Corner Bead

A:  All drywall bead is strictly decretive and non-structural. No load should ever be placed on a finishing bead, regardless of it's function or profile. All drywall loads needs to be borne by the underlying framing. 1x and 2x demential lumber along with plywood (3/8, 1/2, 5/8 depending on design) are standard choices. The singular function the drywall bead is to hide raw edges and joints between sheets. 

A:  Doesn't need to be used for inside corners it is to protect outside corners from damage.

A:  I suppose it could though I’m not sure why. Inside corners aren’t exposed to the wear and tear that an outside corner usually is.