User-written addons
This is the suggestion to end all suggestions, because it would allow people to unofficially implement their own suggestions as addons/extensions/plugins. My idea is to have a script or set of scripts that is loaded on certain microStudio pages to extend its capability. For example, there could be an addon for a "Favorites" tab or code completion. It may also require an interface for ease of use, such as storing custom user data, running restricted code in the cloud, or quickly creating new menu items and HTML pages. It could be sandboxed as well, like how addons for Google services use Google Apps Script with certain interactions available.