It was me not using it correctly, I tried adding new 2D or 3D selector or new brush when in edit mode, changing back to object mode gave no errors so it does work. Sorry, thanks for the plugin and also for taking the time to reply.
Awesome! Really glad that you were able to get around that and thanks for the feedback. I'll have to put in an edit mode check to catch that, super helpful to get user feedback like that so I can smooth out the very rough edges. Thanks again!