When I publish a plugin for the first time, I have to actually go in and install the plugin the same way anyone else would that wanted the plugin. I think it would be cool if we were prompted to install it right away when we publish the plugin.
I would say the same thing about updating a plugin. Having it auto-update when you publish the plugin would be cool and would help streamline the plugin debugging process. Currently we have to go in and update the plugin manually from the plugin manager.
Current system works fine, but those are just some improvements that came to mind.