There is a first play command in one of the icons above the project list (on the left side). However, DVDA does not have the facility to insert a "user prohibition" which prevents the user from fast-forwarding or or using chapter advance to skip a section of video.
If the DVD has already been viewed in the past in a specific player and another user put the DVD in the same player, the playback will auto resume at the same position (if this function has been turned on in the player setting menu).
Is there a trick to bypass this auto resume fonction in the authoring stage to make sure it never skip the first play?
Not so! DVDA2 (and presumably DVDA3) offers a "Remote Buttons" property. If you turn all of those off, the poor user is powerless to escape from your video.
Yup, you are correct. Somehow I was thinking of the registers that can be set in a DVD so you can have one thing happen the first time you play something, and then do something else the second time something is played. DVDA doesn't have this, but doesn't need it for what we thought was being asked for.