I just wish there was a couple features for when creating a submission or a comment:
Picture drag and drop - when adding a picture to a submission, you could add it by dragging it and dropping it to the dialog that shows up to pick a picture (also maybe adding a picture by its URL address would be great);
When replying to a comment, you could create quoted text directly by selecting the text from the comment you're replying to, so said selected text will show up as quoted in your text input area when you hit the reply button - Reddit does this and it's a nice feature to have versus copying, pasting and editing it so it turns to a quoted text