I already posted 2 small patches using the forum.
I have some more improvements to propose to the dev team but I don't know where and how to do it.
For example, I have a patch that may have some interrest for those who can't or don't want to use a ftp account for plugin installation and updates (a checkbox in admin that allow to bypass ftp usage). I had some problems with it and I know I'm not alone.
But as it is not a plugin but a core modification, I believe that if the dev team approve my changes, it should be put in main distribution.
So what is the proper way to propose modifications?