The ability to scrobble your anime watching activity to myanimelist.net
Not something we plan on doing, but the API is available for any developer to integrate Trakt.
It's not scrobbling but http://txm.huere.net/ will sync your history to your MAL profile.
but it does not sync to MAL from your trakt history ...
I used to use MAL when I was an Microsoft OS user over 5 years ago
then I used xbmc/kodi as player with trakt as scrobbler
Celeste Celeste commented
There is a program called MAL Updater that does that already