Based on the Remote Central it sounds like light control integration is not easy to do, but still doable???

Is it possible to do but complex?

According to Harmony, this is doable.

Excerpt from review:
"You can't configure fonts, change layouts, upload bitmaps or even easily integrate a lighting device. You can't download an entire XML file for your system's complete layout to store on your computer, or upload a setup from the Harmony."