Corridor Warrior
A bureaucrat (potentially with good intentions or an optimistic belief in his ability to change lives for the better) whose area of battle is a corridor. Loiters outside office in long corridors, using the informal space to perform job-related tasks and politicking which should take place inside the office.
"Dave's a bit ineffectual in his role, really."
"You're not seeing him in his natural battle-space - he's a real corridor warrior."
"You're not seeing him in his natural battle-space - he's a real corridor warrior."