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The pin and password should not be tied together where the admin can't change the user's pin without also resetting their password. An admin should be able to change the pin as a separate action.
Fellow super admin here, you don't have to change their password to change their pin? Go to Users > Users with Extensions, then search for the user you want to update the pin for. Click on the users name, click on User Details, click Change Password, enter your admin password, select the "Change Pin" tab and enter the new pin they'd like, then click save. You do not need to also fill out the "Change Password" tab, you can leave that blank.