I recently installed xfce4-plugin-wavelan from a deb package obtained from a deb repository and a xfce4-cpugraph plugin also from the same repository. I'd like to understand the mechanism for asking for a package to be included in the distribution and for its maintenance to be done. Are there any licensing issues we have to be aware of in these cases?
No mechanism, just ask or do it yourself. Building packages is very easy with SliTaz. All GPL or copyleft software can be added. For non-free or binary stuff we usally make a get-* package which download software an build a pseudo(fake) package.
And like said babaorum, please, switch to the new forum.