1) Sliding Glass Door. You place it down like a normal door, but when you "right click", the glass will slide to the side or slide back into its original spot. The frame stays where you placed it, but the glass pane slides out.
2) Angled repeaters. Help us shrink our Redstone stuff quite easily. Just a repeater where the power comes in one side, then goes out in a different direction (like a right angle). Also possible repeaters with multiple sides accepting inputs / giving output, for perfectly directed current.
Glass doors.. Idk we kinda can make them with pistons, What I would like is a huge door, like the one you see in churches or the door leading inside Hogwarts. Well that kinda does seem useless now that I think about it
As for the repeaters, yes, I was thinking about crossing wires, and even compacting the standard gates down a tiny bit, but I was also thinking about a totally custom repeater property where, when crafting, you would do a slightly different pattern to customize your repeater, allowing it to take input from multiple directions, or provide output in many directions.