I've been doing this too since I have lots of fuzzies still but no pups, so I feed two one week, then give 7 days and then feed one, then 5 days then feed 1, then 5 days and feed 2 again. I don't stick to it religiously but I fluctuate a little.
That said, I only had 4 snakes before, now I have 6 and looking at getting 3-4 more, at that point I don't think I'll be doing odd schedules much longer, as of right now I have half my snakes eating 2 days before the other half, so it feels like every 2-3 days I'm thawing rats and offering. It would be much easier/simpler to just feed once a week. It's hard to not want to offer the girls food more often though and get them bigger faster.