I'm guessing that "plus" should be mapped to the "Menu" key, right? It seems like a command that brings up a menu of options. I could perhaps map the "question" key to the "Info" button, if that makes sense. (I really don't know what "interactive" does...)
And yeah, it looks like the Sky Digital boxes are all manufactured to use the same remote controls, so one should work as well as another. I'll have to see if I've got any other Sky Digital keysets sitting in Pierogi, maybe I could just merge them together...