The only thing I shrink out are the ATT address book cod's
All Nabsync.cod, I believe there's 4 or 5 total.
There's a new shrinker tool for OS6, I'm not totally sure on where to find it as it came with BDHP v5 hybrid.
If your used to shrinking your 9700 OS, then OS6 isn't much different as far as the java folder, some minor difference but if you don't know then leave it be.