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is there a specific command list to use with FSUIPC.
General command such as Z (autopilot) or CTRL+SHIFT+G (TOGA) do not work?
And that is by design. Many of the basic FSX/P3D key short cuts are removed as the aircraft's autopilot is somewhat complex by design.
The method to control the Q400 with FSUIPC is either via the XML interface (documented in your aircraft folder) or via some Lvars. Anyhow you have use LUA programming to access the functions.
If you are not a programmer, you might check LINDA (google for it), which has also a Q400 module for connecting hardware to this plane via FSUIPC and LUA.
If you are a pro user the easiest is to use the mjc84.ini method.
Here's how I have it set up.
=; See SpecialFeatures.pdf Joystick Connector section for description