if you use acl_hosts, it can be useful to allow access to the server for all hosts with known mom with only one option.
In our heterogeneous infrastructure we have several domains - you can say “a domain per cluster”. The domains are not fully dedicated to the clusters. Others, unrelated services can be found in the domains. So allow whole domain in acl is not a good idea. Itemize all hosts with mom in acl_hosts is ugly.
I think to add a new option that allow access to the server for all known moms would be useful for others too.