Firstly yes this would work but only if you are in a group/raid with those members who are mining, secondly why not try using the latest version of Gatherer which shares your found nodes with every other person in your "Party/Raid/Guild" <<< I get about 200nodes a day appear on my maps from guildmates who automatically share their finds.

I'll see if I can find a way to automatically updated your main but I think you have to left click a node to actually broadcast its location....