On this question on tex.SE (and on many, many other posts on several sites) I once again noticed that pictures uploaded are always made full page width.
This is often way too much for the image. For example in the linked question, I uploaded a math-formatted equation. That would fill the whole width and become enormous. So I have to append white-space on either side of it and upload it like that.
Is there no way to set image sizes? At least to set the sizes to the original image sizes - I would understand issues with users setting their own dimensions, but at the very least the picture should not be shown in larger dimensions that what it is uploaded in.