Ralph,
We are experimenting with showing the altitude with a color coded climbing or descending arrow above or below the altitude. That way you'll be able to glance and see the altitude and if they are climbing / descending towards you. This would be for all traffic, 360 degrees around you.
I agree with needing traffic behind you. I had that scenario happen to me, where a faster plane was overtaking me from above and behind.
I was a high-wing and it was a low-wing, so we were in each other's blind spot. The vision-pro and iFly alerted me of it and we avoided each one by about 500 feet, he never saw me.
I personally care what is all arround me, not just infront of me. That includes mapping, obstructions, traffic, etc.