Lemmy Apps

I'm not currently developing a Lemmy app, and I have no plans to, so this is not a market research post for myself. If anything, I'd like it to be a resource for existing developers to see which features the community most wants!

So, putting aside regular features (e.g. things that the Hard-R app already does), I'm specifically wondering about which less common features you all want?

Here's of one of mine:
I'd like to be able to limit my usage of an instance to a specific account. For example: I never want to post to LemmyNSFW from my main account. That's what my alt is for. So I want to be automatically switches to my preferred account per-instance when I interact with it (or at least give me the choice to switch on-the-fly when composing a post or comment).