It would be a good idea to add option to enable/disable skipping proxy for local addresses. I would submit a patch for this, but there is no public repo.
The skipping doesn't do a DNS lookup, so only applies to things like local network IPs and hostnames without dots. I prefer to keep options to a minimum, so don't plan to add a toggle for this. The code is MIT licensed so you can adapt or republish it as you wish.
