I have created the same setup as lexus and Mark in GroupWise 5.2. Except the rooms, vehicles, etc. are called GroupWise Objects (not Resources). We also make one individual the owner (with full control) while others can read-only proxy and send appointments to reserve the object - with the GroupWise owner (controller) of the Object having the power to Accept or Reject the appointment. The individual who is normally responsible for the room, vehicle, etc. gets to be the GroupWise owner. It's the only logical way to set it up.