Jeff
What I have found works great with Panasonic Projectors is to use power toggle mode instead of discrete on/off with the Harmony. This prevents it from accidentally turning on if hitting the help button if the unit is already off.
Send power toggle and two enter commands to turn it both on and off. When hitting help on the remote it will ask before it acts.
In configuration of your projector
-Adjust power settings
-Turn off when not in use
-One button on the remote for turning on/off
-My Device needs more commands
-Use : Power Toggle: ENTER: ENTER

Also, the Function button on the remote can be programmed to head straight to an input. Other than that Panasonic Projectors have limited input selectors. There are a few commands that Logitech and add to your file to give you a HDMI only selector. That will toggle just the HDMI inputs. Getting a receiver with HDMI switching will solve all of the headaches. Call customer support and they can add the commands for you.
Hope it helps.