its a good idea, the hot air station with a button on the handle piece have a hair trigger pushbutton. If you set it down on the bench for a sec and get up, even rolling the tool over will trigger it. weller....
the one you place back on the magnet to turn off are also liable for getting stuck and stuff, especially if sticky from spilled flux that caught some wire scraps.
IMO these things are like 10x more hazardous then a soldering iron for starting fires.