Amen on the sub-standard heater unit. I have thought about adding a Red Dot 2-fan heater under the front seat blowing forward to keep my feet warm. Used to do it in the old Cabover Freightliners and it helped a lot. :-laf
You don't realize how poor a design it is until you ride in a GMC or a Ford and have to turn the heat DOWN after 10 minutes or so because you are too hot in the winter. Oo.