There seems to be a bug in the world generation of TerrainControl dev build 142. I have replaced every mention of lava everywhere in the configs with AIR and I even tried adding (LAVA,AIR) to replacedblocks.

When I generate my beautiful space world I'm getting these nasty lava snakes squirming around that you see in the screenshot below (they are green because of the resourcepack I'm using).

This is a fresh test map.

I've removed all lava from resource queue also. There should 100% no no lava in the world but there is as you can see here:

https://snag.gy/hGEn6P.jpg

Oh. And this seems to be the underground lava type. The removal of lava from resource queue seems to be working AFAIK.

This lava is part of the cave generator: any cave that reaches below a certain level is flooded with lava. There is currently no setting to control this. The best you can do for now is to set the CaveMinAltitude (a setting in the WorldConfig.ini file) to a higher value.