Hello Mega,
- we can implement a way to move like in Creative Mode, but it's fairly easy to get to the desired points by simply slowing down the camera by scrolling down with the mousewheel already.
- Showing the inventory of other Players is not possible as the Server only tells you what other Players have in their hands, not what they have in their inventories.
- Gif Support for Custom Image Objects is planned, as you can read here.
- Can you please elaborate this bug a bit more, and maybe create a new Thread in the Bug Reports section? Thanks in advance.
- This bug is known and will be fixed in a future version.
- You can already spectate entities and players, read more in the docs.
Thanks for your feedback, I hope I could clear some things up for you :)