I want to say, everything what you suggesting, already exist in game Activity around mining fields? We already has pirates around mining fields. Activity around hauling stuff on PoB? Play for unlawful faction and look how it work already. I cant understand, about WHAT it is all? Problems not in "spreading mining on different ids, spreading of mining fields".
Else, do you guys dont realise, for miner-traders rather plays people who dont want PVP much. Even pirates looks like harrasing for them, and you suggest contested zones. All oficial factions, who can mine, how i can see, do their work already good.
Update: Just wanna ask, what you dont like in nowaday mining? Mass mining always boring in every game, people already optimize it by PoBs and enhanced traders way.