Can't see or control gizmo visibility in 2.8
This may be a 2.8 thing more than a problem with the addon. I see that the show_manipulator and show_gizmo propteries/functions were removed a few commits back. I can't figure out how to have the gizmo show in 2.8 so that global/local/custom transforms could be implemented in a physics session.
It seems the gizmo disappears when animation is playing, outside of whether or not an interactive physics session is happening
https://blender.stackexchange.com/questions/147319/transform-gizmo-disappears-during-animation-blender-2-8
Ah, interesting. On a quick search... I wasn't able to find a solution to this. I'll keep my eyes out.
The issue has been reported; awaiting a response: https://developer.blender.org/T73844