I don't know about the note thing; it might be intended behavior, it might be a bug. We'll look at it, but it's a pretty insignificant problem (relatively) so I doubt it'll be something we focus our efforts on.

Post-blocking should be possible, but after some testing, I can't get it to work. We'll get back to you on this- there will be a forum post on development changes that we make going forward.

Lastly, the site is derived from the source code of danbooru. Danbooru is like e621, but for anime. We ported the latest version of danbooru to this site, which changed much of the underlying code and modified the layout some. We made the rest of the changes ourselves. The site's code has already seen some changes, minor bugfixes and the like.

Like I said, now that we're at this version, we're probably gonna take the idea of forking off to our own features more seriously, so there will be a log of what's changed added. Right now, though, barring massive bugs, we're probably too busy playing Fallout 3... >.>