I think it should be possible for the founder or the WA delegate to be able to (if the founder lets them) demolish the influence level of members therein or raise them back to their maximum amount (perhaps use a divide function instead of actually altering the base number).
This would allow the regional management to have more say on how influential someone is which is not dependent on time in the region. It may be more fun for the Raiding Defending too, I don't know.
The regional management in my region for instance, might want to give members with more ''influence'' more say in how the region is run, but if that nation is disruptive they have no way of sending them to the back of the class as it were.
It would also make the region more appropriate by being able to clearly highlight who tends to have more influence in the region as well.