I found a bug in the LG TV app with Live TV, but it got me thinking. I used the SIPTV app before, and they have a feature where you can watch TV guide/switch channels when playing the current channel, like it happened in this bug. Maybe it would be possible to map such an overlay feature to one of the color buttons (red, green etc.) on the remote? It will need some work to make the overlay text look better/clearer but it wasn't too hard to read already.
Not sure If it's difficult to reproduce this bug, but it happened when viewing TV guide, I clicked on the current program in one channel then quickly clicked back on the remote.
And also, will the primary screen when opening Live TV via the my media section up top work the same as Webapp/Android, I'd like to click on that directly to open TV guide.