This is a very nice development, thank you! This makes Rclone useful even for the less technical people now. Nice how you made the MacOS application, in the installation screen, a walking owl to the application folder! 
Super that it also reads the existing Rclone config directly, makes it hugely flexible.
First feature request, maybe an option to also configure specific Rclone flags by a connecting, instead of only the global flags now at the settings tab.
Thanks, Tom