1) Yes you can surely ask users to add sex (M/F/C) when registering at your website,
and in integration you can attach the sex parameter with parameter: init_gender.
Check the first method at this page:
http://www.123flashchat.com/docs/User-Profile-Integration
Method 1: Adding parameters after 123flashchat.swf.
You only need to add the following parameters: init_birth, init_gender, init_location after 123flashchat.swf.
For example:
http://yourdomin/123flashchat.swf?init_user=owen&init_gender=1&init _birth=19830702&init_location=USA&init_email=support@123flashchat.com
2) To disable editing profile, the function is also available.
http://www.123flashchat.com/docs/Profile-Manual
Disable Edit Profile
To allow users to choose their avatars instead of editing their profiles, please check the "Disable Edit profile but enable Change avatar".
