Modify/Customize the ACCOUNTS Tab

Question

I am trying to modify/customize the Accounts Tab in the Administrator Interface.
There are 3 sub-tabs under the "Accounts" Tab : LIST USERS...........FIND USER.............LAUNCH BULK ACTIONS
*(a) Firstly, I want to remove the LAUNCH BULK ACTIONS Tab completely*
*(b) I want to modify the FIND USER Tab.* This Tab contains a list of options (all search criteria) for location a User. I want to remove ALL of them, except the very first one (which is a drop down menu for selecting Name, Firstname, LastName, or Fullname).
*Name...............equal to/contains/like........................[ TEXT BOX ]*
I want to retain only this search option.
*(c) I would also like to add more fields/variables to that drop-down menu.* By default, the menu only lists Firstname, Lastname, Fullname. I would like to add other fields there too.
Any help will be greatly appreciated.

Answer 1

Thanks sec_tk
couple of problems :
(a) when adding attributes to the FIND USER drop-down menu (via the User Search Defaults Form), IDM does not allow me to remove that first default parameter  ("name").
Everytime I load the page, it keeps searching for that very first parameter. When it doesnt find it, it gives me the following error :
WARNING :  attribute does not match any of the allowed values for "Search Condition 1"
How do I get rid of this?
(b) the administrator I created does not have any rights besides Create and Edit User. No bulk rights/capabilities whatsoever. How do I remove that "Launch Bulk Actions" sub-tab?
Thanks