Mike, as far as I know, no standard agency teaches anything regarding emergency decompression to recreational divers beyond the "8 minutes at 15 feet" idea.
UTD Rec 3 teaches the use of helium mixes for the deeper (100 - 130 feet) recreational range, and discusses how to manage a small amount of mandatory deco.
I believe GUE Rec Triox teaches some information about backgas deco as well.
It is very reasonable, in my view, to teach recreational divers who want to spend more time in the deeper ranges, something about how to determine a reasonable amount of decompression and where it should be done. But along with the intellectual material comes the education on how diving changes, once you have incurred a decompression obligation, and the training to solve problems and deal with issues underwater, since once you are in deco, you can't just surface if something goes wrong. Also, you have to have a sense for calculating gas requirements and safe reserves. Just knowing how many minutes of deco are required and where they need to be done is the very smallest piece of being prepared to handle a decompression obligation.
UTD Rec 3 teaches the use of helium mixes for the deeper (100 - 130 feet) recreational range, and discusses how to manage a small amount of mandatory deco.
I believe GUE Rec Triox teaches some information about backgas deco as well.
It is very reasonable, in my view, to teach recreational divers who want to spend more time in the deeper ranges, something about how to determine a reasonable amount of decompression and where it should be done. But along with the intellectual material comes the education on how diving changes, once you have incurred a decompression obligation, and the training to solve problems and deal with issues underwater, since once you are in deco, you can't just surface if something goes wrong. Also, you have to have a sense for calculating gas requirements and safe reserves. Just knowing how many minutes of deco are required and where they need to be done is the very smallest piece of being prepared to handle a decompression obligation.