5. I like the game mechanic that lets your wingman mine the same asteroid you did, because it encourages cooperative gameplay.
Take along your 3 friends in fast ships and bring a Conda or T9 to collect resources. Search for painite a then mine it together (x4 painite).
After T9's cargo bay is full, escort it back to starbase.
There is no easy way to fairly share the spoils amongst a mining wing. If player trading were in the game then I'd agree, but as it stands being able to exploit the same 'roid multiple times is as close to multiplayer mining as it's possible to get; efficiency is multipled not by the number of pilots as it should be, but by the number of mining lasers and refineries.
In an ideal world, only one ship - the hauler - would fit a refinery.