Pretty much what Karma said.
It's something we've been bouncing around a while. But the thing is, the spells have some usefulness that isn't "abusive". They're good utility spells that, used in moderation, are cool things to have. And punishing everyone for a couple abusive players isn't really a cool thing to do, so ultimately we decided against that.
I still need to get an updated FAQ done (If nothing else, to cover some of teh new release books). I will likely be adding a bit about these areas of magic to clarify them a little bit when I do (Which means I need to find the time. Argh!) ...
1) Clarify that these spells are not particularly subtle, and that the target is aware of them. So you can't just mind screw Mr. Johnson and expect to get away with it. The Noticing spellcasting rules are in full effect for these.
2) No "PvP". There will be a blanket rule that in "Open Play" (Non-home games, such as Convention games and events at a CDT Firebase), you cannot use mental spells or possession against an unwilling PC, and that you should not deliberately attack, hack, or otherwise screw with another player.
I get so pissed off when i hear stories about someone sitting down at a table to play a game of Shadowrun with a bunch of strangers and they had a miserable time because some twinked out munchkin spent the whole game screwing over their character. Especially if they justify it by saying "It's in character".
Fuck. That. Noise.
In a home game, sure. Shadowrun isn't always fair, and players can be backstabbing assholes. But at an open game with a bunch of strangers, if your fun is coming at the expense of another players fun, you're doing it wrong. Everyone at the table should be able to enjoy the game. This goes doubly so for any game at a convention where someone may have paid $4-6 to play.
Things like this should be common sense and a part of common courtesy, but those are rare traits these days. Thankfully this doesn't seem to happen much, as i've only heard about a few instances. But teh fact taht they do happen annoys me. So we obviously have to add rules for such things.
Bull