TOPIC: Bar code

You event registration is by far is the most thought out of the others seen on joomla.org I am very interested in utilizing your software for my business and for some of my clients use to set up their events as well. Is it possible to customize (Will pay you for your time/effort) or add on any of the following features?: 1. Bar code for printed on each e-ticket/registration conformation to clients? 2. Scan bar code at event to ensure no duplicate entry from same registration sheet? 3. Have multiple users with different level of access? Thank you, Dave