An idea that just crept into my head:
Walls are currently rather useless, especially in the latter part of the game. One way to make them more useful would be to provide a movement penalty for units attacking. Afterall, they'd either have to go around them until they found a hole, or stop and blast one themselves. Either way there will no doubt be plenty of rubble they'd have to crawl through as well. So losing one movement point seems like a reasonable penalty.
Walls are currently rather useless, especially in the latter part of the game. One way to make them more useful would be to provide a movement penalty for units attacking. Afterall, they'd either have to go around them until they found a hole, or stop and blast one themselves. Either way there will no doubt be plenty of rubble they'd have to crawl through as well. So losing one movement point seems like a reasonable penalty.
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