It should be possible to add resources to onsite appointments. For example if an onsite visit requires the use of company equipment then it would be great to be able assign this equipment to the appointment in order to book this out for that time and date, such as a company vehicle or other resource. This would also work for booking internal meetings, so that you could add to the appointment a specific meeting room and projector for example in order to ensure that it will be available for your needs.