Questions about user posibilities in WP

[Fonz]

I've set up a blog for a camsite where camsters can have some sort of diary. Each diary would be a subcategory of the category "Diaries" like "Diary of Suzy", "Diary of HotPussy".

I've got 2 questions:
1. Is it possible to give a camster only rights to post in their own subcategory?
2. Is it possible to include a standard piece of html code in each post like a link to the camster's profile on the camsite? This code should be set standard and should be unique per subcategory so the camsters don't have to add this link themselves.

Thanx in advance.