When you get a /32 allocation from ARIN you are expected to announce a aggregated /32 prefix. Now what if you want to allocate addresses to a site that is not part of your backbone network. Everything I've been reading assumes you have a backbone network and can allocate /40's per POP then aggregate all the /40's into the /32 you announce globally. Announcing all of your /40's globally doesn't sound like a good idea so there must be a better way to handle it.
I believe the assumption is that all of your PoPs are interconnected, so the /40's can be aggregated upwards to your main PoPs, and advertised into the global table as the full /32.
I've heard it said that if that is not feasible, then you should apply for another /32 specifically for the PoP that is not interconnected, to avoid de-aggregation.
Steve