It would be GREAT if we could craft a multiple tiles horizontal (or vertical) foundation line (basically a row of single foundations that can be placed in one click).
It would be a huge help when people are trying to build on extremely uneven terrain, also quite helpful when people want to place foundations perfectly aligned between two points (say, you want to build a wall and gate between two rocks, but you want them perfectly aligned) its really hard and time consuming place foundation one at time, just to find out they are not aligned, and have to destroy them and start over again…