I've requested that the Japanese immigration officers place the stamps on specific pages, and they always comply. (My passport real estate is also nearing Hong Kong levels of crowding) However, the stamp is a bit oversized; ah, at least there's no more departure card to fill out.

I used to relish getting stamps. Now it's just a pain. Ironically, that's where Hong Kong gets a plus (no more stamps), and a minus (that stupid easily lost chit which prints out). Macau is the same.

My last passport was so full, someone even stamped the other side of the photo page. Got stuck at Cairo immigration for an hour trying to explain the deal.