Raising priority to 1. I think it might cause fatal errors on occasion.

It's not serious if it won't cause a fatal error, so I'm not certain where to set the priority.

Darkness, Improved Fireball or Teleportation would also be pretty cool.

Teleportation especially. It should allow teleporting on unreachable areas like HMW or Library.

Improved Fireball might look cool for a split second, is range dependant on Wi? Darkness would be cool if it made all the underlying locations dark, but I don't think that would be the case :P.

Or the Red Rooster Inn, But maybe Mystic Shovel would be the one needed. Right after Magic Map. Magic is after all needed to get past those High mountains.

Fireballs in the wilderness are awesome. In 1.1.1, with max Wi, you could torch a third of the Chain with an alchemy explosion.

I don't recall that being possible. Maybe because I never tried. Applying alchemy in the wilderness, mmm. Can it still be done?

Fixed.

No, it was fixed in one of the early prereleases. The fireball had no effect on the environment anyway :p

No, but it looked cool... ;)