Would make a lot of sense if it warning was variable, but as it stands, it’s always the same amount of time, so it’s of limited benefit.
I’ve looked at the code, and the only thing that’s different about the “coming from behind” is the direction they are coming from. There’s literally no other difference. What you’re probably referring by “two directions” is that the direction is not the same for all asteroids, but it’s slightly randomly jittered for each one. But all meteor storms do this, not just the backwards ones. I won’t change that, so the choice is whether you want it back as it was in v.45 or not.