Since creosote is intended to prevent bugs biting away rails, they should be able to damage arthropods. I suggest the addition of splash creosote to damage arthropods and make arthropods slowly lose health when in creosote.

There are alot of improvements that could be made to the brewing system. This seems like a neat idea, but it would be a novelty item.

If there were more to this, then definitely

This will probably wait until the addition of creosote back as a fluid.