It's up to you how it behaves: 1. Like Totem: It immediately goes to the end or the beginning 2. Physical Rewind/Fastforward (holding down said combination forwards/rewinds as if rewinding/fastforwarding a tape)
Will consider adding this feature.
Currently in git-master the rewind and forward buttons have been replaced by previous and next, so at the moment hitting the left or right arrow on your keyboard triggers that. Not sure what gain it would be to skip to the end of e.g. a song, because in fact that'd just take you to the next song.