Sandbox

I modified the core base to add/modify some features:

* com_content : in the articles the publication date is displayed (insert date is not useful to me)
* com_latestnews : order by insert/mod/publish date, limit search to some sections
* includes/joomla.php, includes/database*, com_content : checked_out flag active only for one hour to avoid objects locked foreveri
* admininistrator/componenets/com_content : filter to select unpublished articles from list (useful when you have many articles)

The question is: how can I submit these mods to Development Team for review?

I believe you first need an account at joomlacode.org. Once you have that, you can write a tracker against those components and attach patch files to your tracker. Patch files can be generated inside Eclipse (there may be other ways, but that's the only one I know).

These all sound like viable changes except maybe the first one. But then, I am not on the dev team so I am not a good judge.