This mod adds some ABM's and stuff that cause lava to ''spread''. Instead of having lava lakes, they will fill up mostly over some time. If the lake is connected to a cave system with a ceiling at least 4 blocks high in most places, it will also fill that cave. (but the area for lava to ''rise'' has to be a 3x3 square with 4 blocks of air above the center)
Also, another ABM turns some flowing lava nodes into lava sources, as the number of sources will drastically decrease as the lava rises.
So, if you decide to use this mod, remember to close up the entrances of your mines if you find lava, and please don't put lava on the surface, let it find it's own way to the surface and make a cool volcano or something.
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Downloads:
v0.4
v0.3 (outdated and unstable)
v0.1 (outdated and unstable)
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Depends on default. bucket, and Rath's cooling lava mod, so that it will work to make real volcanoes.
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Screenshots:
This is the inside of a cave, where I poured some thick lava, and it began rising. I had to remove some of the cooled blocks, just so you know it will most likely need people to interact with it (some) to make a volcano:

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For best results, use worldedit to dig out a shaft down to a cave system, and at the top have it connected to a cave system that opens to the ground above. Put a lot of thick magma in the bottom, and set the cooling rate in INIT.lua to 60 orso. Make sure that you remove nodes that would obstruct rising (4 air above the center of a 3x3 area of thick lava). Once it begins flowing out, wait for it to get about 2 blocks high, and exit the game, set the cooling rate in INIT.lua to something like 10 or 5. Go back into the map and wait for it to form a shell. exit, change cooling rate to 30 orso, and enter again.
if it is possible to make ''timers'' that change the cooling rate/rising rate, I will most likely try to add that to the mod.
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Also, thick lava now generates like an ore in lava lakes!
