What about pole barns and similar structures? You can use treated wood indoors but not if it was treated with creosote. On other types you simply need to paint the wood, use shellac or enclose it within a wood enclosure.

Granted, this isn't timber framing but I totally agree with the other posts regarding the unsuitability for such. However it is dirt simple and I suppose the oldest framing method.

Since most utility poles are treated using creosote you would be limited to storage structures that are well ventilated and not inhabited by humans! An example would be a storage shed for farm machinery.