Here are the logos I made for PMMP: ...and some banners: Here is the imgur album link: imgur.com/a/jrCie
As a Favicon, it wouldn't work, because It is too small to, and would be pixelated-ish. That's why it is left blank at the moment.
No. When searching through closed issues in the old PM github repo I found an old TODO list, on which implementing the Nether reactor was. The box was never ticked. Dundundun...
My opinion is that it should be something PE-specific, similar to how the nether reactor core was for the old PocketMine.
The camera is an item specifically in Minecraft: Education Edition, even though it may be a hidden item in PE & win10, it wouldn't be considered specific to PocketMine.