Pictrs is only made for images (and videos), as the name implies. Supporting other types of files in pictrs wouldnt make much sense. This means that other file types would have to be stored by a different backend tool, or directly in Lemmy. As we are only two fulltime developers on Lemmy, we dont have the time or resources to work on this, and need to focus on the most popular features.

There is no way for admins or mods to modify user comments or impersonate users, except directly through the db which is unavoidable.

We had a very long discussion recently how vote privacy should be handled, and the current behaviour seems to be the best compromise.

Multi-communities is one of those popular features we are going to implement soon.