If it was my code to give out, I would.
But I received the efpse source on the condition that I keep it private, and I don't intend on breaking that agreement.
The only way I can release the efpse source without breaking that agreement is if I rewrite it entirely from scratch. Then the code would be 100% mine and free to share.
That was my original plan with this engine, but I figured if I was going to spend so much time rewriting everything from scratch, I might as well make the foundational improvements required to more easily support the features the efpse community was asking for.
I know it's not the same, and I do feel bad about stopping efpse development, but my other options were to continue developing a closed-source engine by myself, or create an open source replica of efpse with all the same design limitations.
I don't want to see efpse die either, which is why I'm developing a more maintainable open source successor to it.