Fill-paragraph and (un)comment-paragraph work fine. ...

Fix kill range of YaTeX-kill-some-pairs.
Ignore begin/end in verb or verbatim.
Indent rigidly initial space between begin/end pairs.
Add yatex-mode-load-hook.
Go to corresponding \label or \ref.

Temporary dictionary. ...

Learn the number of argument(section-type completion).
Override kill-emacs.
Patched posted to fj.sources,fj.editor.emacs,fj.comp.texhax