It doesn't feel quite right to have the access controls at admin/settings/accessctypebyip.

I know there are pros and cons to each possible location, but have you considered putting the IP access controls as a form_alter to the content type configuration pages, or another tab on the content type's area rather than their own separate configuration page? As menu entries go, form alter to admin/content/node-type/% or a new MENU_LOCAL_TASK at admin/content/node-type/%/%. Maybe as another alternative, move them to admin/content/accessctypebyip?