Marc, I took a look at a few of your blogs. Since you don't define many terms with precision, I couldn't mesh a lot with what you're saying. In some aspects of things you and I have radically different perspectives, but simply say "each to his own". Well... there was one blog where you talked about people breathing sometimes while pulling their diaphragms upward that I would take exception to: if air is coming into your lungs the diaphragm *must* be going down. Other wise air would be pushed out of your lungs.
I assume that some people are aware of "Reverse Breathing." The blog that Mike mentions, I use "Reverse Breathing" more as an awareness exercise than for the typical purposes that "Reverse Breathing" is used for. Most people expand their upper chest when breathing in, while relaxing their diaphragm. My use of "Reverse Breathing" is for paradoxical intent. Having students connect their purposeful use of their diaphragm with how most people typically breathe, helps them to transition toward allowing their diaphragms to expand down into their groin area when breathing in.
Reverse breathing is a valuable tool for a number of things. Of course there is also "Ki Breathing." What other breathing methods to people employ and why?