Hi,
The EasyEclipse could come with predefined set of Eclipse Update site URLs. This would go along the goal to eliminate the download hell.
Example:
1) One install EasyEclipse Python
2) It does not contain *any* update URLs in Software update menu
3) Google Subclipse
4) ...
this could be
1) One installs EasyEclipse Python
2) One goes to Help -> Software Update -> Checks "Subclipse"
3) Done
Since Update site URLs don't add anything to download size you could include update URLs for *all* plug-ins and thus enable single click installation of everything, still keeping download sizes small.