[Balanor]

Red Wizards already get a number of special abilities. Being able to control advancement of another faction's members is not one I want to add to the list. However, Red Wizards still technically have the ability to command a ranking member of the Legion to perform one of those actions on a member of the legion even if they don't agree with the Red Wizard's demands....

I didn't want to advertise this yet as it is not yet implemented in the live module, but yesterday as I was working on this a few things got revised and I already updated the Player Joinable Factions thread to indicate the options that are going to become available. If you take a look at it, members of rank 3+ will be able halt faction advancement, 4+ will be able to boot faction members, and rank 5 will be able to give a one-time, one-rank promotion up to and including rank 4 of that faction (but they won't be able to promote others to their same level - rank 5).
As an exception to these upcoming changes, Red Wizards will not be able to halt faction advancement or boot Red Wizard Apprentices - that can only be done by the DMs alone (presumably playing the apprentice's master).

Again though, these changes are not active yet and may not be until the next server update.