Having the source code could be useful, but I can also see it competing with Qt's commercial version of the Qt plugin. I'm quite happy submitting bug reports to Qt rather than trying to fix them myself.

That being said, I've no problems with the community fixing them and submitting patches to Qt, but it's not exactly high on my priority list as I don't have any real problems with the plugin.

Perhaps you could suggest some reasons why you want it open source, besides the obvious? What features would you like to add, and what bugs do you encounter?