Option bits for the Parallel Flash Loader (PFL) Megafunction do not need to be set for unused pages.
The Storing Option Bits section in the Parallel Flash Loader IP Core User Guide (PDF) says the PFL IP core requires you to allocate space in the flash memory device for option bits and offset addresses 0×0 to 0×F of the option bits sector store the start addresses for Page 0 to Page 7.
If you only use Page 0 and Page 1, you just need to store the address of Page 0 and Page 1 in the option bits and you can leave the others blank.