Hey,

here is a wishlist of me:
- Double Pipe to ground: Has a pipe to ground on each side
- Double Pipe to ground 2: Has a pipe to ground on each side + on the sides normal pipe
- Double Corner Pipe to ground: Has a double pipe to ground on a corner
- Double Corner pipe to ground 2: Same as above, only if two pipe connections also

Code wise its just a few lines, mostly copy and paste. The images on the other hand ...
They either look weird or you just can't see in which orientation its placed. Remember that i have to squish3 underground pipes in a tiny sqare where normally sits just one.
This is the main reason i haven't done it ;)
Maybe i get struck with inspiration somewhere in the future ...