Basically, you have to have all the exposures on a roll needing the same development, unlike sheet film. You can't have the start of the roll needing N+1 and the end of the roll needing N-2 for example.
Ah, got it. With conventional Zone N+- processing, that is certainly the case.
However for long, low agitation development that I typically use in such circumstances, the exposures on a single roll can vary quite a bit and you still get good results.
The long development time lets the shadows develop to completion pretty much independent of the scene SBR. So, you have to make sure you expose properly for the shadows. The limited agitation means that the highlights develop quickly initially and then stop developing, so you have to make sure your highlights are placed properly. This kind of development tends to expand mid tone contrast AND push highlights up somewhat, so I tend to place highlights lower than I would with conventional development - closer to Zone VI than VII. IOW you are not using N+- development.
You are counting on long development with very little agitation to hold things in place.
The extreme example of this is that - if you do the aforementioned exposure/placement properly - you can actually develop different films at the same time in the same long development session with same number of agitations and total time.
HOWEVER, none of this is free. These techniques - (semi)stand and EMA come at a price: They are VERY fiddly and it's easy to screw up the development and get streaking and other negative nasties. The single most important thing is to use absolutely minimal support for the film - stainless reels for rolls, simple clips for sheets - AND you have to get it off the bottom of the development tank.
So, it's quite doable to have multiple SBRs on a single roll, but it requires precision in exposure, placement, and development technique. It took me some years to get it right. I've shared my notes on the matter here a number of times if you want all the ugly details.