Correct, you can use the USB-COM in COM1 with GSM-COM in COM2 (I think this is how I used mine too).
Wintex should be able to work out which com port on the PC your USB-COM is connected to (not always the same com port as the control panel). However, if it doesn't then the Wintex manual shows how you can work this out.
I didn't notice any difference in fragility between my COM1 and COM2 on my control panel. Either way, I only use the USB-COM when in engineering mode, I don't leave it in all the time.
The comissioning jumper is for commisioning the wireless riochochet mesh only.
I am concerned that the com ports seem fragile, I would never have thought to to be fragile and I am very heavy handed at times.
If you are talking of putting the panel lid on with the usb attached, I wouldn't, the usb com cable is a tool used for connection to a laptop for servicing so designed to do with the lid off not on. Though some people connect it and have the cable comming out the back so they can connect easily.
The comport being used should be programed as not used for the usb connection to work.
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