Yes, this is an amazing move. All published campaign settings advise the same, but being an explicit rule is great.YGWV - Your Glorantha Will Vary. Whatever you do with Glorantha. it's your setting once you start playing with it. There have been several parts of canon that I've disregarded, modified or used for a different purpose in my time.
Could you, if you don't mind, tell me what those big changes were? because I'm reading from different sources and some contradictions make me a bit dizzy.(the new RQ: Glorantha has made some big changes to the current status of the setting locally)
Anyway, thanks a lot for the advice! Apple Lane it is, and I will check the Pavis Boxed Set and Valley of Plenty, even if it's as inspiration to set the right tone and theme.