About teamkills with those.
Why not include map markers like in PR?
In PR, when you drop a mine, you only get one voice command on the commo-rose, and this voice command also puts a (temporary) marker on the map where you dropped your mine.
Would allow cautious players who check their map to avoid friendly mines, and wouldn't make mineflags on tank mines useless either as those can be seen without bringing up the map every 5 seconds.
Sorry if someone already posted about this.