Personally I think that this is actually a value-subtracted service, as the EP.NET organisation does not run the named boxes, or the exchange points.
It would be much more helpfull the the interfaces that faces the NAP and another provider where following each providers naming conventions, and had a domain-name that would point the users to the organisation that actually operates the boxes.
Yes, that is the desired goal, however some sites are not willing or able to do so, so there is a default case where a name is available. (There are some exchange points where no forward is registered, which can be a hassel)
The existence of a forward mapping is not a necessary technical precondition for you to insert a reverse mapping which points in the right direction, i.e. at the organization operating the boxes. However I also have trouble seeing why any ISP would willingly decline to register it's boxes in the DNS. I fully agree with PL that introducing EP.NET into this is value- subtraction, in that it will just add unneeded confusion. - Håvard