i like the way for expansions buil-in already features like player animations/hands/models/guns/open source project wants to see it more This is a good entry point for beginners and for quickly creating a variety of games from scratch, not just clickers i think More features like this, more game variations, more audience.
For "Envmaps Baking" IMO you should support .NET Streams for both the SaveToVtex and WriteFile (WriteStream?) APIs if you're not already. Byte arrays will work fine for small amounts of data but someone somewhere is going to try to stuck a gigabyte texture in one and then you've got problems. Supporting Streams allows you to internally use a small buffer to transfer any amount of data. Maybe this isn't possible (I don't know what SaveToVtex needs to do internally), but even if not, you still get support for being able to integrate with existing Stream types like NetworkStream and so forth.