An idea for a possible improvement :
When in a topic with only one post, very long post.
I.e: Cuvillier dans CRI-CRI de 1937 - Maurice Cuvillier - Wikibulles
Timeline works to go to the top, but actually not works to go to the bottom.
The only way is to drag explorer cursor.
It would be usefull one can goto the end when click on the bottom time-label, or another button…