Well, I have worked with WL 6 and there you could do it. In stead of Stereo, you just choose 5.1 and automatically all 6 meters were displayed in the record dialog and after the recording was finished all 6 tracks were nicely displayed.
Since when dit Steinberg decide to not support 5.1 recording in WL anymore ???
This is completely mindblowing.
I just installed Sound Forge 14 Trial and there it is possible, without any trouble and works just great.