Major weldfuel explosions go through walls for no obvious reason

[warcrimes]

What they should do is direct all of the explosion in whatever open direction, so like it could fireball an entire hallway instead of just a section of it and parts of other rooms.

So say an average unimpeded welderbomb covers X tiles, it should look for X unimpeded / unwalled tiles in all directions- and then what? 
what if the room is 3x4 like in research, or that realyl narrow maint hall near robotics, which I think is probably the worst offender in this case. it'S a 1 or 2 wide strip with a tank by a window, and blowing it gets the main hall as well as sometimes a second tank inside robotics. 
not sure exactly what point im making, but there's a lot of very wierd positions for these things.