I said I was leaving the forum, but maybe I'll drop by once in a while to post on a thread I like
Since we're on the steampunk theme now, how about we reintroduce gears? They could be vertical redstone.
And since steampunk is a very manmade theme, there should also be a lot of varied generated structures. Chimneys that emit blinding smoke, elaborate redstone traps, etc.
EDIT: How about rather than a traditional dimension, it's one giant procedural structure? It would really fit the dimension well. And perhaps you can't break blocks already there until you do a special task. E.g. I had a Mansion Dimension idea where you had to kill a special Illager before you could break what was there.