I vote NO on event moves. As a breeder and former heavily active member on wifi, I can say that getting these pokemon with just the right nature (let alone IVs) is a truly difficult endeavor if not near impossible. Moreover, the popularization of strategies using these moves on shoddy/sims only adds to the demand for these moves, and subsequent increased degree of hacking in the wifi community. If shoddy/sims/smogon were to not include these moves in the competitive metagame, it would allow the wifi community to make a much better effort at sticking close to the competitive metagame on the sims-- making both communities moreso part of the same community. Smogon is not only a strategy dictionary, but also a community, and a community that would not exist at all if not for the cartridge game itself. Keeping Wifi and Sim players on the same page as much as possible is something worthy of pursuit for smogon. For those reasons alone I think Event moves would be better off banned, though in many cases it is as others have mentioned that their power can be disbalancing as well.
On a different note though, I don't think Legendary IVs are important to restrict. Have you seen the legendary pokes we have in Smogon's wifi community? I would have near-total confidence taking the legendaries I've collected on the wifi boards into a battle against perfectly IV'd hacks. The IVs on Legends are different from event moves in that SRing for near-perfection is a much more possible task, and if anything allowing for perfect IVs on shoddy only increases the motivation on the wifi board to catch better legendaries.
On a different note though, I don't think Legendary IVs are important to restrict. Have you seen the legendary pokes we have in Smogon's wifi community? I would have near-total confidence taking the legendaries I've collected on the wifi boards into a battle against perfectly IV'd hacks. The IVs on Legends are different from event moves in that SRing for near-perfection is a much more possible task, and if anything allowing for perfect IVs on shoddy only increases the motivation on the wifi board to catch better legendaries.