Sorry all, posted this and forgot about it.
I've asked about an AP per room, and been told a big "No!" - however I'm finding that we're installing extra AP's into our Ruckus installations to increase density, and schools are reporting an improvement. So the theory is being smashed by the practice. Yes, you can argue collisions, and performance losses - but I'd rather that, than have headteachers telling me it's no improvement after spending £5-10k. After all the s**t I've had to tolerate from DLink's wireless equipment, I was hoping Ruckus would remove that headache but I feel like I'm coming full circle and seeing the same issue.
Regarding rooms - all companies have been informed that it'll be 30 devices per room, using CC4 which has a large profile - not considered a problem, I'm told.