Options to 1. Avoid breaking blocks that are adjacent to lava while performing "#sel ca". 2. Option to erase lava within selection (or adjacent to it) with throwaway blocks

My main use of B. is to automate things, especially tedious construction projects like tunneling subways or digging holes to house various redstone machines.

The major problem is that when you create a selection for a future tunnel, it just digs through the blocks that are adjacent to lava, releases the lava and gets damaged by it.

I suggest, at the very least, an option to avoid releasing lava, or--even better--an option to erase lava blocks that are inside or are adjacent to the selected space by filling them out with throwaway materials.