Hmmm, I hadn't thought about proposing it as an ongoing article series along the lines of Ask a Shoanti.
I certainly wouldn't want to commit to an ongoing series like that as a single source of advice (I'm no expert in every area of design), so I guess Tim and Paris would need to ask the writers of the best examples of each article type to write a column on working on that type as each issue comes along.
It should be reasonably easy to work such articles into each issues theme, e.g. for the river kingdoms, an article on designing aquatic creatures would be a good fit.
Maybe it could be a guest article series - e.g. ask Neil Spicer to write about good encounter design, SKR for an article on expanding on faiths and gods, Adam Daigle on good creature design at CR 1-3, CR 7-9 and CR 17+ - that way, we can all learn from the best!