As for using public address space in a private enviroment without public AS numbers iit s very simple, private address space is limited to the ranges as detailed in the RFC, this network is going to be global and each network needs to be unique and using private address space would have caused logistical nightmares. For instance it is envisaged they whould run out of address space very quickly as 10.0.0.0/8 whould only be enough for Europe(as have UUNET / Worlcom internal networks), also if you have independant companies approaching the GPSM initiative from differant sides of the globe both using 10.0.0.0/8 and then want to connect to each other directly to enable roaming which company should renumber a multi million node GPSM network. But the use of private AS numbers is not nearly as difficult to administer or renumber to allow differant networks to talk to each other.
If the private address space mentioned in RFC is not enough they should go for IPv6. Because GPRS, UMTS and other stuff is brand new I see no problem to implement IPv6 in gateways (and terminals). Another issue is that roarming. Why roarming have to use unique IP numbers to work? You could use application level roarming solution as well and nobody cares if the source addr have gone trough a NAT box or not. This thing is going to get messy when we get first GPRS phones out.
BTW i find it difficult to appreciate how the use of a piece of software to produce a technical report is a mesure of a persons RIPE compectance, i would rather say its a measure peoples unwillingness to accept another practical use of IP into the RIPE community.
It's not about the software, it's about usability. I haven't found yet a Word application for my PDA, but I do have a browser :) Jorma