Per http://simple.wikipedia.org/wiki/Wikipedia:Simple_talk#IP_block_exemption, please enable a ipblock-exempt group with this configuration
Create the ipblock-exempt group with only the ipblock-exempt right in it, and allow checkusers to add and remove the group.
Thanks,
Techman224
Version: unspecified
Severity: enhancement
URL: http://simple.wikipedia.org/wiki/Wikipedia:Simple_talk/Archive_60#IP_block_exemption_2