Hey! I use tn3270.
Well actually c3270 as it is a bit saner when remapping keys.

But I was very presently surprised to find tn3270 in base. Saved my day 
once.

And thread hijack. As far as I can tell wscons does not send/set 
Shift+Fn keys.

was sort of looking for them as I like to map that to PF11-PF22

It was quite the adventure trying to figure out how(and in what form) a 
key gets to the app.
again a sort of nonquestion.
I think it is
key
   wscons set this via wsconsctl
     termcap/terminfo might be able to set it here but termcap scares me
       tn3270/c3270 hah yet another keymap

so minimum 3 different keymaps add X to the mix and it adds it's own 
freakish system into the mix.