Yes, I did those two with help of my ghost. For both Ally Warp +1 is sufficient. It’s also neat for a room with gold and traps, it doesn’t disable them but you get at least what’s not on a trap.
Yes, it has three commands. When you click on yourself the ghost will follow you. When you click on an enemy it will follow and attack it. If you click on an empty tile it will move there and stay there.