AGS
The lack of fin tank/fuel enabled the Germans (and presumably the Italians as well) to park with wing sweep at 45 (CofG consideration), thus saving a little bit of space in the HAS.
Jack
Depending on mission profile, you would fill every available cavity (well, fuel tanks anyway) with fuel, including external tanks (worth mentioning that fitting larger wing tanks limited the rearward wing sweep). All the fuel controls were in the front cockpit - the nav had only a total reading on a TV Tab - so the nav's contribution to AR was to make soothing noises to the pilot as he jousted manfully with probe to drogue.
Mister B