I've tried to find the best setup for printing on a WorkCentre 7345 from OS X 10.6.7 (Snow Leopard).
With 32-bit apps (eg. LibreOffice and 64-bit apps running in 32-bit mode) I can use the full feature set:
With 64-bit apps, such as Preview, I can only use a limited subset of features:
This is working fine with the semi-official (?) 1.2.0 drivers.
The latest drivers (2.12.0-533) don't work at all:
Currently, there is no support for 64-bit apps and Mac OS. I have heard that there might be a new driver coming soon, but I do not know how soon or what version or what the drivers may provide unfortunately. Right now, the only way for you to print with all of the features in the driver is to run the app in 32-bit mode.