It can be widened.
80 mile radius, anyone?
I like the time shorteners...
And piercing cold would be great.
And, well, too bad I can't fit Eldritch Theurge on this, just for Brimstone Blast. That might sound odd, but think about it for a moment: you deal 8 fire damage, 4 cold damage, and 4 negative energy damage, adn people inside have to make a reflex save or catch on fire.
Add in that metamagic feat that removes saves, and you have a hilarious wintry spell to cast.
"Oh no, permanent winter! Oh no, wights everywhere! Oh no, people bursting into fla... what the fuck?"
Of course, that is less optimal, 'cause it doesn't give you that fast healing if you're a necropolitan, unless you're immune to cold and fire damage.