I have to admit that Ive not paid attention to spawning other than boar runes (shame you cant get a starred one to spawn), its an interesting thing to think about thats for sure. Ive played maps galore and this is the first time ive tried the star wolves. I like the idea of map hopping for farming mats, I'll keep that one in mind as my current population of wolves are eating me out of house and home lol.
Yeah one of the things I love about Valheim is that there is no rush to do anything :D