[kh99]

That's true, but you can do this:

admincp/user.php?do=find&user[username]=pattycake

and it will redirect to the "edit user" page if there is only one user found. You could also add &submit=Exact%20Match to limit it to exact user names (probably what you'd want to do if you're trying to link to a specific user).

Also you should be able to replace user[username] with user[email] to search by email.

If you're writing a php script to do this, you'd obviously want to url encode the user name or email address.