TA: He's definitely been in politics, but it's fair to say he's deliberately kept out of the public eye. I think he's about as easy to get a read on as your next Iranian politican (that is to say very hard; I'm still not sure how much Ahmadinejad is a hawk and how much an opportunist).
tennin: You're assuming a single, unitary Iranian elite which would choose whether or not to commit election fraud.
Iran's got a bunch of overlapping and competing institutions, factions, and power centers. It's not hard to imagine a secretive effort to screw with some of the ballot-counting by, say, local political appointees who rely on the current spoils system or a cabal of Revolutionary Guard officers.
The dynamic you described, however, is a good reason not to think the Ayatollah got together with the Guardians Council and decided they would use the whole apparatus of state to fix the results.