emmm... I was just wandering about and I met a question about converting unit to hero in object editor.
The most part of people say that they can't make Hero out of Unit in object editor, but I know how to do this...
You will need object editor hack, which is in JNGP.
First copy any unit and paste it. You will create non-standart unit.
When you will try to paste unit there must be a message "Enter a desired object ID"
So, you may give it ANY ID length in 4 letters\characters, BUT The first character MUST be Upper Case Letter.
P.S. Sorry for my bad English, I'm from Russia