While collapsing is important, I would really like all comments to be sticky, so that when you scroll down, (only) the first line of all parent comments are sho

While collapsing is important, I would really like all comments to be sticky, so that when you scroll down, (only) the first line of all parent comments are shown at the top in the usual nested way. This way, you always know where you are. I tried implementing this with a custom stylesheet for Stylus (Stylish), but I was unable to due to the site's markdown which is mostly tables with positioning.