I cannot understand what your items 1, 2, 3 mean (item 4 means you didn't find the plugin FindInFiles). Please file an issue in the Github, so we can talk.
FindInFiles plugin exists in addons. About other issues: I will check them, but you can also file a bug report on GitHub.
If you want all of that, and more, there is always Emacs :)
But alas there's a couple of things not quite working for me.
* re-interpreting a files encoding as UTF-16/UTF-8 doesn't seem to switch it for some reason
* no hex mode search and replace (sure you can use regex escape codes, but that's more a workaround than a solution)
* re-opening pngs/jpg other images in hex mode require re-opening the file, just dragging it into the window
* couldn't find the "search/replace in files"