Support for older GM Version?

First of all thank you for this tool, it's great.
Next, I'm sure you're aware of the GM5~GM7 Decompilers out there. There's a tool called GMD Recovery that does the job pretty well. However, it doesn't go beyond 5. I have a a game that's running on GM4 (one of the very first games I've ever made) and I really want to have the source code for it. Is it possible for you to add support to GM4?