Titan restraining devices do exist, you can read a little about them under Shadow Smuggler, though they'll get their own entry into the codex soon. As for having the devices, I'd say cuffs would be fine for them to have, though some of the more potent equipment they'd need further training for.

As for controlling the characters that are non-PCs, I will control them, unless its a mission created by someone else who wishes to control their own non-PCs.