I don't use the pushback tool myself, so unfortunately, I wouldn't be able to comment on any compatibility issues. I'm not aware of any logic in the RJ that would likely conflict with pushback tools, though.
For support with the Aerosoft Toolbar Puchback, I would recommend contacting Aerosoft Support directly, as they will be better placed to assist with any troubleshooting: https://helpdesk.aerosoft.com/
Mark - Just Flight