Can the Request Access to Network Share and Reset Password selections be removed from the Process Manager Submit Request page for All Users? I was able to remove report problem and request change selections via Admin > Users > Accounts > List Groups but did not see anything listed for these actions.
If you got to Admin - Service Catalog Settings, you should be able to delete the options completely.
I generally take away the permissions from everyone but Administrators, just in case I want to implement them at a later date. Like Reecardo said, go to Admin/Service Catalog Settings to modify permissions on those options.