[Brian]

Casper, the Nearby Contexts view will show all your active contexts that have locations attached (in list mode) or will show whatever pins fit on the screen in Map view. (The default appears to be a couple of square miles.)

If you wanted to just set one location for a couple different contexts, you could just attach it to the parent context and leave the children without their own.

For your shopping mall example, I'd probably attach locations to each of the child contexts - that would hopefully ensure that an entire mall's worth of tasks don't all pile up in the exact same spot. That depends on how Google has the map set up, I suppose...