Anytime an item in a weapon set has a clicky that clicky is not usable! Having to double hotbar all of my weapons is such a drag and THF builds don't have to deal with this problem. In order of preference...
solution 1 (best):
if main hand has clicky
-if off hand has clicky and main hand has 0 charges
--then display off hand clicky
-else display main hand clicky
else if off hand has clicky
-then display off hand clicky
solution 2 (off-hand clicky is only usable if it's the only clicky or the same clicky):
if main hand has clicky
-if off hand has same clicky
--then add charges and display
-else display main hand clicky
else if off hand has clicky
-then display off hand clicky
solution 3 (off-hand clicky is only usable if it's the only clicky)
if main hand has clicky
-then display main hand clicky
else if off hand has clicky
-then display off hand clicky
At least for me 95% of the time either only 1 weapon has a clicky in the set or they both have the same clicky.