To back up what Rob said… SafeCracker is a better method of handling what is normally handled by a Stand Alone Entry Form. SAEFs don’t work with the Pages module, so SafeCracker does not either, and in the near term will not. We currently have no plans to support the Pages module.
Similar to the Pages Module, Structure adds a new tab to handle its data entry on the backend, so this isn’t going to be something that’s supported either. Several modules like Structure and Tags that add CP tabs are out of the scope of what SafeCracker does. You can pretty much bet that if there’s a custom fieldtype, it’ll be supported by SafeCracker. If the functionality is added as a new CP tab, then it’s probably not supported.
It would be great to have the support for this stuff, but it’s just not a priority now.