Ah, good catch. It's a 0x2C, which gives it Still, Quicken, and Maximize. No Extend.
Looks like 0x2E would do the trick, but I've never messed with spell 2da's before, so maybe that would turn the caster into a penguin

Edit: Actually, what does it mean to Maximize it? Probably ought to be 0x3A -- Silent, Still, Quicken, and Extend