This is just were I will put any ideas that I think would fit into the game, most of them will probably be for creative since I like to build in Yeeps :). Each space is a new idea, and I don't expect all of them if any to be added to the game, but I felt like listing off my ideas, and I might come back to ad more
I think a creative mode chest item would be cool especially for puzzle maps and I map I'm working on, it would be unlocked with a key and when do so an item that the owner or staff of the world put in come out and be picked up. This item would work kind of like a key locked dispenser, but I think if it just was a dispenser with a key hole it wouldn't look as cool as a chest.
When you have the FPV camera and the drone I think when you pick up controllers you should be able to move it yourself, now if you don't have controllers in either hand it would act like normal, but it would be cool to move it around yourself, this would be good for content creators and I can see some cool maps like FPV races or only up styles of maps.
Imagine a map were you look down and slowly you see lava coming ever so closer to you. I think if there were wires in some of the creative world adjustment blocks a lot of new worlds could be made, and with what I was talking about that could be done by having the liquid shifter having a pulse to rise it, and if the map resets it would go back to whatever level it was in the creative mode version, this would work for the height shifter
Talking about water, it can be annoying having to move you're whole map up to try fit a pond of water, which is why I think if you could place two marker blocks, paint them the same color that the water could be limited to being set to that position inside the markers, whether it only works with two or more, as having more than two blocks could get complicated.
While building, it can get annoying when you imagine your scene being a day but the suburbs map is at night, ran out of characters go comments