I would like to see ZIP-Files be handled like folders today, creating an archive format.
One could open a zip file exactly like a folder. Editing files would update the ZIP.
Also, if a sublime-project file would be found in root of the ZIP, that file would be made the active project.
UseCase/Application:
Single File projects that could be easily shared and filed. Mostly of interest for MarkDown documentations and similar projects.
There is a ZIP plugin that already gives access to ZIP files, but I envision a bit more.
Maybe this can be done with a plugin?