Been playing a little DotA 2 and I'm in love with the feature that you can draw stuff on the minimap.
i.e draw an arrow for a push. a smiley face if you want to cheer someone up.
In general the concept of this idea is great imo because you can then easily draw where do push etc etc. I think its a fun way to show people where on minimap they should be instead of the normal ping.