trigger device connection manually

hello all,

a quicky, someone know how to stop the automatic detection of the device when calibre starts or when the device is connected ?

am looking for a way to have a button and trigger the connection manually

the reason is that sometime, I am copying something to my device and I start calibre. the device will be immediately passed offline then online again, but the copy will fail a this point.

also, if I start calibre with the device connected, calibre will hang until it has scan my device for ebook. that can take some time and be annoying if I need to just locate a book or some simple manipulation that does not concern the device

thanks for the help

reup