Yer a wizard harry

[Clarks]

Dopellganger: this spell is useless. Let's change it entirely. Have it work so you can take the appearence of a station employee for 30 seconds, similar to vamp. Combine with empower for max gain.

Doppelganger is great to send a mob on a wild goose chase while you skulk in the other direction. It could only be improved by having the fake wizard select a random direction to run into whenever it hits something it cannot move through.

Fireball: Many a thread suggested this would work better as a staff.
Shockwave: this would be more interesting as a staff. Hitting a person will send them flying as if they were hit by an abomination, whilst hitting the ground beneath acts like spell (has a charge) "you shall not pass!"

It's incredibly easy to lose your staff. The staff of cthulhu is only worthwhile because the crew will usually not know how to move it safely and get tons of brain damage, give up and leave the staff where it was dropped.
A special staff will be a wasted spell most of the time, unless there is some protection like cthulhu has. You could put it back in the pack after every use, yeah.... but seriously?