User unique ID for each game

Hello,
I have a few questions:

1. I need to know if a user can select what games he plays and if they can add a unique ID (nickname) for each game. And all of this should appear in his account.
2. If a game doesn’t have a map, how can I disable the map section from a tournament page? Now it appears a box with a “no map” message.
3. How can I add extra fields in the registration form and synchronize with his account (First Name, Last Name), and how can I make location and city required?
4. If I create a team, how can I add a member. Send them an invitation to join the team.
5. When I create a tournament, I need to add an extra option to Game frequency, and Tournament frequency. I there a possibility of doing that?

If there is something I can’t do with theme options, can you estimate a cost for this customizations?