Thanks to a bunch of work from Kherron, User Controls have being added that let you create, customize or use pre-created user control just like Plugins. It will allow users to download (eventually) vast collections of pre-made controls to help rapidly create complex screens.
Even before this, our custom controls were not working on the Web UI, but Kherron has updated that too and the user controls have a part for WPF and ASP in them so they work in both environments. Yes this still requires the developer to make two GUI's for each control as the web cannot display the same Windows WPF xaml code, but the backend code is pretty much the same despite what tech the display mockup is using.
The holidays can be unpredictable, but here's to hoping for a solid product soon!