Hi @astro,
Many thanks for the kind words! 
I’m glad to hear you’ve found another one of my extensions useful.
Many thanks for the listing catalogue menu idea, too. I’m not sure if you’ve had a chance to check it out yet, but HivePress has some of this already built-in by default. Under HivePress > Settings > Listings tab, scroll down and enable:
You can have a play around with this for now. You may also find this topic useful, as I implemented something similar myself.
In regards to the idea as a whole, it does sound really cool and I’ll try and find some time to have a look into the feasibility of it all soon. I’m currently in the process of an all-existing-extensions-update, and I’ve always a few more ideas in the works behind the scenes that I’m working on, but I’ll let you know if/when I get round to this! 
Cheers,
Chris 