I'd be fine with rubble taking longer to move through than normal terrain, though that does make it something of an oddball. Then again, I guess all Vanilla "terrain" is oddball in some way since there's so little of it.
Then you could also make it so tunneling through walls first converts them into rubble, which then has to be tunneled through as well to make a clear space.
Then you could also make it so tunneling through walls first converts them into rubble, which then has to be tunneled through as well to make a clear space.
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