I'm sorry that always delayed response and solution for you,
The delay is mine and controlled.
And the time difference is inevitable.
For your simple task :.....
Sorry for my english...
User 1 : Makes 2 questions and can only see her 2 questions
User 2: Makes 1 questions and can only see her 1 questions
.....
User 73: Makes 1 questions and can only see her 1 questions
...
User 1240: Makes 4 questions and can only see her 4 questions
(Not possible with permission by categories and would need a category for registered user
)
Expert 1: You can only view questions of its category assigned and can respond (This is eassy, permissions by category and ACL Group)
Expert 2: You can only view questions of its category assigned and can respond (This is eassy, permissions by category and ACL Group)
...
Expert 28: You can only view questions of its category assigned and can respond (This is eassy, permissions by category and ACL Group)
SuperUser 1: Moderate and assing questions to category expert
SuperUser 2: Moderate and assing questions to category expert