Some will have been suggested before, but here's some things I picked up on with what I've done so far (I'll try keep them short)


Blocks that can grip to the floor for climbing hills (or if there is some, make it more obvious)
Different sized gears integrated with wheels (attach a gear to an unpowered wheel to link them up)
Bind multiple keys to blocks (already even seen that posted)
Item groups (edit stats on multiple blocks at once)
Multiple object select and move (so you don't have to rebuild an entire section if it's one block too high)
Visual firing lines from cannons when holding down the fire cannon button (so you can aim, although I get why the devs might not want this)
Option to view vehicle stress (just to see what might need reinforcing if you're falling apart a lot)


Also, the depth of field looks so nice so I won't turn it off, but it's a bit annoying having it permanently activated near the floor when you're away from the vehicle