Oh, ok. I see what you are wanting.
No, that is not a feature I have ever seen anyone else ask for, nor do I see much of a benefit beyond making sure your installers don’t connect a CPE to a sector they are not supposed to. (I actually forsee that kind of feature being a support pain because people will set it and then not be able to connect a new CPE device)
That said, if you really want to limit the number of CPE that can connect, one option you might have is to use VLANs and limit the number of VLANs to each of your access points through a managed switch/router. I am isolating my customers with VLANs right now quite successfully and it makes some management aspects of your network simpler. BUT! it will require quite a lot of network setup and configuration, so it is a bit of a pain in the neck.