Very well-thought out ideas & fixes -- I would esp. love to see half-walls, boats (even just being able to create a paddle or an oar to use with floating leaves) and an elevator (within reason, i.e., not going up hundreds of stories; even going to the top of the bird bath would be pushing it, IMO)
Butterflies/Moths, Mantis and Dragonflies all would be really neat (mantis are actually pretty vicious - I watched one stalk a stink-bug on our window screen and when it got close enough, it pounced & ripped it in half in a flash!)