This is not strictly true.

If you select all of your contacts in apple address book and then hold down ALT whilst you drag them this will export them as single v-cards. Then in GPE contacts click tools, import, and then navigate to the folder with your contacts, now "Ctrl A" to select all and click import!

To delete your GPE contacts in bulk go to the terminal and type "rm ~/.gpe/contacts"

Every now and again I do a bulk delete and reinstall to keep the N810 up to date.