Hi,
Sorry for the confusion on the ticketing plugins. I can answer your questions.
1-I understand that admin has to approve transaciton for tickets to be issued. Is there an option to skip that step and have the tickets issued after checkout completion?
Yes you can use this coding from WooCommerce to AutoComplete the Orders:
http://docs.woothemes.com/document/automatically-complete-orders/
2- Is there a way I can give access to signed in users to create events, create tickets, manage their tickets sales and attendees but limiting their permission only to these items in wp-admin?
It could be possible, but you would have to setup a custom role to do that.
3- I’ve tried the demo but didn’t receive any ticket example (I guess it’s because admin didn’t confirm the sale). It would be cool to see an example and what if the person receive emails in plain text?
Correct, the demo does not autocomplete orders. Here is what the ticket email looks like:
[caption id="attachment_928051" align="aligncenter" width="665"]
Event Ticket[/caption]
4-Can the person use the e-ticket at the door without printing it?
Yep that could be possible.
Let me know if you have any follow up questions.
Thanks