Alexa ArriRaw - Can't Import Footage as a Sequence in AE CS6

I'm working with ARRIRAW footage which is recorded as a sequence of .ARI files. CS6 supports ARRIRAW, but it won't allow me to import them as a sequence. Sooo... I imported them all as individual stills, selected all of them in my project, clicked 'New Comp from Selection', and specified the Still Duration as 1 frame. Now this ALMOST worked, but the fact that I can't change it from Base 30 to Base 24 means that the each frame duration is too short for my 24fps composition.
I'm kind of between a rock and a hard place on this, so any advice would be appreciated! I either need to be able to import my .ARI files as a sequence, or I need to be able to change the Still Duration to Base 24.

Any advice would be much appreciated!
Thanks!