We modders will sometimes takes request from others, but seeing that you already made two posts that request for an add-on, I would really suggest you to learn making add-on so you don't have to wait.
I'm not telling you to, well in a rude way, shut up, but by learning modding yourself, you won't at least let yourself down. Take your requested shark add-on as example, maybe we just can't reach your target. It's never great for modders when their users were not satisfied. So why not just learn it yourself? I learn modding just because of that as well.
But of course, feel free to leave suggestions, maybe someone will accept it though don't expect it to be a short period of waiting time.
I would say that's out of ModPE's limit, but it depends on how big of an area you're moving, a small portion will be fine but huge one will take some time for it to load and may even crash the game. If youre moving a huge chunk then I would say using map editing software is the best solution