Just going through the new WinWing Input configs (DCS 2.8.0.33006 Open Beta) and note that the above file does not appear to contain a mapping for MDI PB 9. The other two MFD files do.
["d3018pnilu3018cd35vd1vpnilvu0"] = {
["added"] = {
[1] = {
["key"] = "JOY_BTN38",
},
},
["name"] = "Left MDI PB 8",
},
["d3020pnilu3020cd35vd1vpnilvu0"] = {
["added"] = {
[1] = {
["key"] = "JOY_BTN34",
},
},
["name"] = "Left MDI PB 10",