Assuming that you were already using Remote Configuration, I've been informed that it was my non-standard control setup that made it work for me but nobody else - you need to change the "drag map" key bind from left-click to something else (perhaps middle-click or right-click). I doubt there is anything I can do about it, other than recommend players change this ingame.
You can give a +1 to my bug report here: https://forums.factorio.com/104694
But I'm not hopeful it will be fixed, and I can't think of any other way around it :(
And 1.1.75 is also bringing a crucial API feature to allow me to emulate the vanilla behaviour where you can click to start a wire connection, then press Q to cancel the connection whilst still holding the wire item. Currently in Wire Shortcut X, pressing Q will clear both the wire connection and the held item.