Problem:
Mining rediculously long sections of straight highways should not be possible. zig zag mining should also not be possible. This currently allows people with macros to basically mine 24 hours until they reach what they want.
solution:
have a % chance of a collapse on ALL tiles not under supports, so this means even your first dig into a wall when you have no metal.
I think this would make mining more realistice, more dangerous, and make it harder to find rare metals. and hopefully make botting non-existant in mining.