[emacs-w3m:04570] Re: pages on that SPC and DEL work fine

> Neil W. Van Dyke presented useful idea in [emacs-w3m:04522] (see
> also [emacs-w3m:04523]).  His w3mnav.el works fine even in Google,
> but the following changes are needed.
[...]

w3mnav.el looks good fro me. Why it is not merged into emacs-w3m?
Any technical reason?