Ability to copy/paste pages, components, etc
One thing that would make development must faster is the ability to copy and paste objects such as complete pages, individual components already on forms, data sources, etc.
Image slider, which you can upload images in, and the user can slide them to see many pictures at one place without having to show all the pictures on a screen.
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.
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.
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.
Clone Pages and Apps
The ability to clone pages would be very helpful when multiple similar pages need to be created. Also, identical pages sometimes render differently for some unknown reason. Cloning could help avoid such issues.
3rd party auth
Flow functions that would implement 3rd party auth tools (Facebook Google, etc).