Examples of validity check queries, where the terminal will respond true/false:

"Someone is in C-6 right now."
"Lightdarkness is in C-6 right now."
"C-6 has a gas terminal."
"There's someone at a gas terminal right now."
"There was someone at a gas terminal last phase."
"There was someone at a gas terminal on phase X."
"Lightdarkness tried to kill Tasselfoot last phase."
"Lightdarkness tried to kill someone last phase."
"Someone tried to kill Lightdarkness last phase."
"Lightdarkness has used a gas terminal."
"Lightdarkness has killed someone using a gas terminal."
"Lightdarkness was killed by a gas terminal."
"Lightdarkness used a gas terminal last phase."
"C-6 has changed since the last time I was there."
"Someone has found one of the power generators."
"Someone has found the door to Metal Gear." (Side note: the inspiration for the victory objective was actually Where In The World Is Carmen Sandiego. I'm sure someone actually watched that show. Remember how they had to find the the stolen item, the warrant, and the thief to win? Same principle. Remember how Rockapella used to sing "THE WARRANT!" in harmony when they found it? Not the same principle.)

Basically the only forbidden questions are ones that involve peoples' statuses as wolf/human.

Bad queries:
"Lightdarkness is a wolf."
"I have encountered a wolf before."
"There is a wolf at a gas terminal."
"Lightdarkness was killed by a wolf." etc.

Keep in mind that for gas terminal to work, the gasser has to know pretty much exactly where you're going. This encourages lying about where you'll be only if the enemy knows where a gas terminal is! If the wolves don't know any gas terminals, you're pretty safe. But if there's always someone in a particular room like, for example, C-6, the wolves would be smart to gas it. Then go there and smash the terminal. The wolf location report is primarily meant to keep humans on the move instead of hanging out in the same rooms harvesting information. Plus, exploration is necessary because the humans don't automatically win if the wolves are all dead. They have a mission to accomplish, and the fact that they've killed all the enemies won't stop some of them from killing each other out of paranoia. Of course, if the humans can communicate the fact that everyone needs to get to a psychic terminal and see that the wolves are dead, it's game over as soon as the humans figure out what rooms they need to be in to trigger end-of-game.

(But this is another fun opportunity for the wolves. Hack the psychic terminal to say all the wolves are dead. This game is so full of possibilities.)

On the other hand, if enough humans are dead that they cannot conceivably carry out their objective (remember, it takes 4 to trigger end-of-game with the current setup), wolves automatically win.

Upon further evaluation, superscrambler is an overpowered move. Basically if the wolves are getting their butts kicked they can use it. However, this means that the humans can be on the verge of collecting enough evidence to figure the whole thing out, and lose because of the superscrambler. In a game that's about collecting a bunch of evidence it doesn't seem right to have a weapon that renders all evidence useless. In addition, it's one of the few terminals that is only useful for one side, and it's far too useless for the other. Superscrambler is out.