You can also teach areo's as well with no further tests
Also most plane insurance has added on the bottom to any named pilots.
"And holders of an Instuctors rating"
This is a link to ontrack
http://www.ontrackaviation.com/cri-se.htm site. I have no link to them at all.
And
http://www.ontrackaviation.com/iri.htm for the IRI apparently they don't require the CPL.
My mate did the CRI SEP course with John, throughly enjoyed it.