I always thought something like greenstone would be handy.
Literally the same as redstone in every way but doesn't join up with redstone.
Maybe also add a repeater-sized converter that switches it back to redstone (and vice versa).
This is something I thought up after trying to cram three seperate circuits into a very small space whilst completely surrounded by rooms that I couldn't use as space.
Just a spacesaver, really.
TheYellowCellPhone said:
I still opt for a block, like a mattress, that when you fall on it you don't take any fall damage.
This would be really nice too. Much neater looking next to my (upwards only) elevator than a plunge pool.