They changed/fixed a majority of the things I complained about.
I think it was better being restricted to 1 miner, simply because these mines are not based on going as deep as possible, I went down just 1 level and earned about 8EC's, 30Diamonds, and various quantities of Iron, Stone and other gems. That's a fantastic return on 35EC's... To allow just anyone to enter into a mine with that low cost - high reward, it's madness.