1. I wouldn't drop them, I like them, however, I think they should remain persistent. Depending on your module size, you would only have so many active at a time (delivering data) but once an asteroid is depleted, they should remain as markers showing what you've already prospected and/or mined out.
2. I don't think we need this if we have the above...and, for me, it is a bit too much of the point...click...profit
3. Agreed
4. Agreed...tie refinery bin number to module size and yield amounts to class
5. I think they last plenty long enough as is....what do you mean by charge per min...charge of what?