I don't believe it.
My flatmate started work on an app to encode specifically for the H3xx last night, just before you posted this.
There's some big differences though.
His is in VB, so windows only. It's also being tailored to my needs, which means no configuration, just drag and drop to encode. It's still in development but the basic code is working, he's just tidying up some the code for file splitting and some extra features. I'll get him to post it if he's willing to share.
I can see your program would suit most people, but this one is handy for beginners and lazy people
/k