Add Collapsible Forum Categories extension

Is there any chance the phpBB website team responsible for this forum would consider installing the Collapsible Forum Categories extension?

Since many forums are now running phpBB 3.1, I'm guessing members might find little use for the phpBB 3.0.x category and being able collapsing that whole structure would be helpful and would improve the user experience here.

Forum post: Per https://www.phpbb.com/community/viewtopic.php?p=14333421#p14333421