Hey guys,
@rob sorry - I didn't see that you had more questions.
Sooooo.
a) Users doesn't have to beregistered with google. They can be either registered on your site or be anonymous.
b) Yes you can do that
c) You can't do this with anonymous users, but if the users who submit locations are registered members of your site, then yes you can
d) No, there is no option for this. You can use the "author of item is moderator" option in CComment to make the author of a Hotspot moderator on the comments that are posted for this hotspot, but he won't be able to completly disable the form.
Regards,
Daniel