V2.1 has the new browser user interface which makes setting up deck buttons a lot quicker and easier : you can select / resize / crop icons and add button commands on your PC instead of your device. Both mobile app and desktop app need to be updated to the new version.
Adding an extra 'group=' parameter to commands should let you manipulate objects inside groups. Everything seems to work as expected except moving objects. Altering x/y co-ordinates doesn't work as expected when the object is grouped - will look for a fix!
The setvar command had a bug that could stop a variable's new value being available immediately - fixed. You can now use a host name (instead of IP address) to connect to the desktop app and control things remotely over the internet. Drawing live now has some extra configurable options and custom actions available to make it easier to use while streaming live.