Is there an option included for prompting users to change there password after their initial login?
If not may I suggest possibly adding this feature to a future release.
There's not. That would require a custom login page, which isn't currently included in the FBA Pack. I have implemented the feature for a client though - I added a new field to the user information list that stores whether they have changed their password. I redirect the user to the Change Password page when they login if the field has not been set. I also reset the field when they do a password recovery.
Feel free to add it as a feature request in the issue tracker.