I have a Tex Beetle and I wish it had this feature.
In fact, before I bought it I thought it might (and I was willing to gamble knowing it was risky) because on the back diagram there were L6 and L7 lights that weren't represented in the diagram. Because the diagram only covers the left side of the keyboard, I thought maybe one of those would change the Fn key on the right side. Unfortunately I didn't notice that on the front side there are no keys for L6 or L7 (they are labeled on the front side, possibly not easily visible in the photos).