> Regarding the encourage effect Stefan mentioned, I think Elisp sources already

> have this effect and is better than C source in this aspect because it’s easier to

> understand, manipulate and play around with.

I couldn't agree more. Any Emacs user already has an Elisp interpreter installed, and can change, explore, experiment. Having the elisp sources at hand can be a useful tool for learning and extending.

The C sources are anything but trivial to understand, and cannot be changed unless you invest time in setting up a build environment. Anyone who will know what to do with the C sources, or even will learn anything from them, quite likely will already know how to get them.