FBlockScoreNoShieldMult

Limits the effectiveness of your block skill when you are blocking with a weapon or hand-to-hand. In crude terms, a value of 0.5 means that your block skill is halved when you block with a weapon or hand-to-hand. A value of 1.0 means that blocking with a weapon or hand-to-hand uses the same effective block skill as when you use a shield. The actual formula is more complicated than that and is not fully known.

Note that this setting also affects blocking by NPCs and creatures.