As for the feature suggestion I mentioned earlier, it would be having an option of including an ad within a single post (e.g. the first), like shown in the image below. This would be (in my case) a replacement for the in-between-n-posts option, considering that Adsense only allows 3 ads within a single page.
Edit: Another way, at least that I hope it wouldn't be so hard to implement would be to be able to limit the number of in-between-n-posts impressions - e.g. from 1 to infinity.
Edit: I moved this out of my initial post for clarity.