Rasplex with Berryboot and hdmi_pixel_encoding = 2

I want to use the full RGB 0-255 range with Rasplex (my TV supports it). I used to be able to add the line hdmi_pixel_encoding = 2 into my config.txt and all was well. I’m now using Berryboot, and while I’ve put that line into the config.txt in the Berryboot menu it makes no difference.

Does anyone know how to get that working?

Scrap that it seems to be working now!