Does Altera support ZBT SRAM for Stratix II devices?

Stratix II wasn't created with any hooks for ZBT and Altera hasn't published any analysis on supporting this. It is probably safe to say that if someone wants to do ZBT, they will have to take this risk on themselves. ZBT isn't rocket science though so if you want to take some risk you should:

Pick an implementation strategy (pins to use, etc)

Create a timing methodology

Explore the datasheet for key parameters

Perform a timing analysis

This will get you most of the way there.