Quick answers since I am relearning frontpage.
1) yes you can but there is not a one click button for it you need to go through all of the control panel permissions at least for guests and users. And only allow the subscription group access.I will find a post here somewhere later.
But you may want a welcome forum viewable to guests so they know how to gain access.
2) Yes the easier way is to edit the language files but I think there is a topic in the How do I Faq forum on this.
3) No, This is something I have requested many times. Hopefully it will come in version 8.??
4) Control Panel ยป Primary Settings+Advanced Options
Deselect "Show Debug Information in Footer?"
