The problem with plugging a cable into the Zendrum is that it negates the MIDIJet add-on for the instrument. I like reliability, but I like my $400 wireless system as well.
Hey there! Had new information that I felt warranted its own post.
According to 109, the power switch can be bypassed so that when the main cable's plugged in to the instrument, the instrument is powered on. He says it's not risky any kind of way and it's how all Zendrums are shipped that don't have the internal wireless.
If you're very concerned about your switch, perhaps this is an option?