[capnq]

does the arrangement affect combat or? anything at all?

The weapons fire in the order they appear, left to right.

Putting the shortest ranged weapons first probably doesn't make much of a difference; I just prefer sorting them that way. It might let you waste fewer shots with multitargeting, if the short range weapons can kill the closer target.

Putting the higher damage weapons first can also save a few shots, because the higher damage weapons have a better chance of killing the target before the lower damage weapons fire.

Special damage weapons can hit their specific targets and leave the other components for the non-specialized weapons.