So, I was browsing the heroes-files and found a .exe file called AssetsConverter at this location: Code
\Battlefield Heroes\Tools\AssetsConverter
I ran it and it gave me a few errors, but I just clicked "OK" and continued. Then suddenly this window popped up:
I havn't got the guts to try edit something, but the tool certainly looks interesting. It eg. allows you to run bfh in development mode etc.
Mrtn