React to mousewheel while key is pressed

[sirinsidiator]

I am looking for a way to cycle through a list with the mouse wheel while holding a key.
All I managed to do right now is zoom the camera...
I wonder if this is even possible without using some hack like placing a Textfield over the whole screen?

local function StartAction()
  SetGameCameraUIMode(true)
  GuiRoot:SetHandler("OnMouseWheel", function(control, delta, ctrl, alt, shift, command)
    d("wheel")
  end)
end
local function EndAction()
  SetGameCameraUIMode(false)
  GuiRoot:SetHandler("OnMouseWheel", nil)
end