1) Is there an 'official' (or suggested) place in these fora where to put user-contributed plug-ins for the other to download?
Should they be posted in the "Example plug-ins" sub-forum? User-contributed plug-ins are not necessarily "examples", not even "exemplar".
2) Are there guide lines for suggested / preferred / requested physical details of distribution? Like: one single archive, please OR multiple files are also ok; for archives, please stick to .zip (or whatever) OR .tar.gz is fine too. And so on.
3) Is a specific form of licensing (or a range of roughly similar equivalent licences) suggested / required? Is the publication of sources a requirement or the simple .jar is already enough (as long as it works, of course)?
Comments from everybody is welcome, but some sort of 'official' statement about these points from JIW would be greatly appreciated.