Unfortunately tieing the rooms together like this would require a lot more work than it might seem. The actual room contents are generated independently of one-another, and so tieing their size together would effectively require fully generating the next floor before the prior one is generated. I also don’t think that landing onto a mageroyal is going to break your fall in the way you imagine, it could just as easily apply the refreshing effect and then the damage from the fall.

I’m also not too keen on giving players more ways to mitigate fall damage, as the elixir of feather fall already exists for this purpose.