Volumio/Flirc USB/Harmony remote

I purchased the Flirc USB Receivor and set it up as a Flirc Kodi in both the Flirc software and and the Harmony remote software. And what works is the following:

Play - Pause - Volume Up and Down - Next Track - Previous Track

What doesn’t work:

Any of the menuing. So I can’t go to Queue, or go to Browse or settings etc., These all appear to be mouse clicks and not key board keys so perhaps that is a limitation of the Flirc?

Does anyone have any experience with this? I would love to be able to fully control my Pi3B+ Volumio combination with the remote.

Thanks in advance for any replies.