I don't think it matters much, there won't be much moisture left in thin wood after 2 years. Most of mine are naturally air dried, and I'm not going to fuss if they get wet in use. I'd certainly use an oil not a varnish, as varnish will wear off and need redoing.
That scout staff page is amusing, he's cobbled together a variety of historical things done to produce an overloaded multi-tool. But I don't think they were all done on the same staff. But no mention of how to use it to assist actual walking.
The tacks or inch markings can be used to calculate approximate heights and angles. The tacks or furniture dome tacks were very small and didn't weaken the staff. The cup hook screwed into the end really is useful, I'm trying to come up with one for my fishing pole conversion.