I suggested this a month or so ago, and one of the Devs (I think it was Rich, without checking) said that they could do with that feature for their game too.
Don't know if that means they're working on it or not though.
My top-down driving game uses a huge area of land, and the minimap shows the full layout.
I think we'd all like to be able to zoom in to just show a couple of streets at a time, like GTA or Saints Row.
Sponge.