Matukio 3.04, Joomla 3.1.2

When testing Matukio I find all participants with the same mail address get the same reference number for their bookings (the number which is random hex, like FE5DBBCEA5).

As long as it is allowed to have more than one booking from the same mail address is it wise to have the same number on all bookings?

Another thing: When put on the waiting list there is no info in the confirmation mail to the participant nor the organizer about this. It seams to be OK, which its not true when put on the waiting list. There should be a message telling them about the waiting list. Have I overlooked something here?