1. I think it would be nice to have a unified system of checking for new plugins and installing any new desired plugins from inside C2. Correct me if I am wrong but I think the way it currently works is by posting new plugins in the forums (such as scirra.com/forum/zack0wack0s-construct-2-plugins_topic43422_post271418.html where you download them and manually install them. I am thinking about a system that would allow you to check for and install new plugins from inside C2 (and then perhaps restart C2 (if needed) after new plugins are installed). It would also be nice to have which versions of C2 (r51 for example) the plugin has been successfully tested in. Also giving it the ability to detect, download and install an updated version of a previously installed plugin would also be great. This would also probably include some extra work on the web site.
2. Collision polygons would be liked by me due to the way I create my levels.
3. Support for the Chrome or Mozilla web app stores would be good but only if it is possible to make some decent money through these.
4. C2 may already be able to do this but having the ability to access and use external java-script files would also be nice.
Jason