With some pre configuring (like the photo of the list above this post) Can you nominate say, a whole area as an @context area with geo reminders?
So you park your car - in a shopping area check OF and it tells you what you need to (can) get in that say, square mile..?
How would you set distance parameters..?
In the map view above, tapping the arrow on the right side of the label gets you the list view for that context. Tapping the left side of the label gets you the Maps application for getting directions there. In the list view, tapping the mileage button (which is straight-line distance, btw) will do the same thing as tapping the left side of the map label.
If you wanted to make a context for a shopping center, for example, you could set it up with an address of one of the stores there, or by using the "current location" button when actually at the shopping center. Then you could assign actions that would take place at that shopping center to that context, and be reminded of them when you use the Nearby feature. However, that would lose you the flexibility of having it suggest that you could do some particular errand at a different location (a different Home Depot, for example) where you happened to find yourself.