This thread is only intended for those of you who don't know this already (like me).
Also, if you use the Aux channel for emergency shut down, this won't apply either.
In most of my planes I program an "idle up" or "high idle" with gear up.
This allows to cut the power during some maneuvers without fear of the engine going too low on RPM and potential flame out.
This sounds very good.... BUT, I just found out while doing some radio programming, that the engine will then not shut down while the gear is up !!!!!! So, this procedure is definitely a NO, NO. Sounds obvious, but..... I guess learning never ends !!!
I know: As a result of my ignorance, I was not complying with the rules !!!! (just trying to save some posts

).
The best thing to do will be to program the ECU with the throttle trim for start up in the middle position, and use some trim for a higher idle. Unfortunately, there will be one more thing to remember during the landing approach [:@]
Using the shut down switch is also an alternative; but when I learned to fly, the radios didn't have switches... so, I still sweat every time I have to flip one different from Gear or Flaps (the only two I use, btw).
Hope this helps somebody.
Jack