I'm not sure if all the codes are "officially" published anywhere. I've just found them on the internet and tried them and seen which ones work. I don't know where the original posters got them. They may be in service manuals or maybe came from Ford or dealer employees.
You'd have to look at the documentation for other adapters to see whether they allow custom codes or not.
One thing to watch out for is that some devices don't turn off when the car turns off. I got one that worked with my phone but you had to manually flip a little switch to turn it off, otherwise it would stay lit up until your battery died. Sooner or later I know I'd forget...
Those codes were not published, but a way to get those codes were hidden in information in Fords Workshop Manuals. After we posted those codes, Ford removed a way to figure the codes out in the '08 Manuals. Hopefully, Ford will not figure out and shutdown this information we are still getting. It's not coming from Ford Employees or the Scangauge folks.