There is a command to disable Narration, it is sv_coda_mode 1, so with "bindtoggle f sv_coda_mode" you just had to press f to enable and disable Narration. Im pretty sure it does nothing except that. The name implicates that the games are in the state where coda made them, but you still have to wait for Davey to speak and the lampposts are there etc.

http://www.speedrun.com/mc/run/52879 <- This run was rejected, because i turned around before moving, but must runs do the same and were verified. E.g. the best run of this Category even jumps, looks around and opens the inventory.

The best run at the Easy Category has 3m and 36s, but in the video it it 3m and 26s.