Custom React Native / React web plugins
Make it possible to add a custom React Native / React web plugin via a GitHub repository, so that the plugin also tells Composer the view components / flow functions / required build service settings it provides.
Support for push notifications with custom backend
Provide the necessary flow functions to get the device token for sending push notifications that can be uploaded to a custom backend, as well as Build Service options to configure the built app binary to receive push notifications.
Embed HTML component for web
I should be able to add a web-only component that embeds and evaluates arbitrary HTML code wherever I place it on the page (with big notifications about the possible security implications, especially if the HTML content is loaded dynamically).
Possibility to create local notifications. For example a similar notification every day at a given time.
3rd party auth
Flow functions that would implement 3rd party auth tools (Facebook Google, etc).
Custom domain names for web app deployments
Allow custom domain names (e.g. www.myapp.com ) to be set up for app deployments via the Build Service, including SSL certificate setup.
Navigation - Customization
Navigation customization is very low. I would: Hide header bar on some specific page Hide the first page from navigation Insert an avatar on the header
Advanced navigation configurator
The upcoming navigation configurator will give users full control over navigation, from full styling of the autogenerated navigation elements to defining things like soft tabs on the page level, as well as customizing navigation individually for different form factors and devices.
Google Firebase as a first-class citizen.
Provide option for Firebase for items like auth/firestore/notifications/etc.
Array manipulation formula functions