SV9100 with Hotel/Motel licenses.

I'm not too clear on the voicemail for each room. I've got the analog, single line extensions for each room set to motel mode. I can leave a voice message and turn on the MWL for a room from the front desk.

1.) Is there a way to keep a room phone from hearing and following the choices from InMail to create a greeting, change password, etc?
2.) Can the front desk clear out any messages left in a room's mailbox, at check out? Or will the integration with the PMS do this?

Thanks!
Jim