It may possibly be a W7 issue, but am unable to assign -Z-Axis ID4 in controls under any version; though I had set this up in the past.
manual entry in config woulld seem the only answer here-
and in User/name/settings ini1RZ3=0 100 100 100 100 100 100 100 100 100 100 0 0
Doh ..my oversight.. response curve on that axis had been set to zero (no idea how) in the "Input" window, so was not responding in HOTAS assign "Controls". Of course while unassigned it did not show in input so i was unable to check that without the manual edits above.[HotKey move]