Personally, I use the full map mini-map in PvP, but while that does give me a look over the whole battlefield at a quick glance, it’s less accurate in telling me whats happening close to me, but the default mini-map does achieve this.
So, I thought it would be nice if you could change this setting on the fly with a quick short cut. Preferably so that you could choose a default and pressing a button would bring up another minimap mode, as a toggle or a hold. I think PvE already has this, too.