4chan now supports de-pagination/infinite scroll. Just click "All Pages" in the page navigation (to the right of Catalog), or select "Always use infinite scroll" in the [Settings] menu (note, you must have the inline extension enabled to use this feature).
The inline extension also now supports enabling the thread auto-updater by default. Just select "Auto-update by default" in [Settings], and threads will always auto-update when you load them.