I used to notice a lot of following traffic mention this over the radio when we lined up at LGW, kind souls, but nobody bothers now they're used to the Q400s there.
I still don't know why the SOP is to manually lift the switch in the line up checks, as it will click up on it's own as you advance the levers and leave the spoilers down as I'm sure it was intended that way, but as said above, I only drive them as I'm told to......