It has already been figured out...See my last post...You need the 2005 Miata remote and the 2005 Mazda 3 key...that combination has worked with the 3rd Generation proteges...It will cost you almost $200 bucks tho..
yes, all the buttons SHOULD work.
all the details are discussed in this thread -
http://www.mazdas247.com/forum/showthread.php?t=123648928
Sick. ProtoType5 you're the man!
I'm gonna have to save up for this though, $200 is a lot!! Plus I wanna make sure it works before investing into this. Anyone wanna be the test mule?????
Matt