One of the things I enjoy in games are being able to change how the game ends. For example, have a main quest, and depending on the players choices the MQ may take a whole different route towards another ending. For example, maybe let there be split points in the game towards four different endings. The possibility to follow the alternate MQ can come at different points in the game. That's wonderful and I hope we get it in Fo4.

Tried to include a poll but it isn't working.

The one problem with Branching MQs, and this is why a lot of other Devs dont even try to make non linear games, is that you end up creating a whole lot of content that the player may not end up seeing.... Fallout already has a lot of content that is "Skipable"

That said, i would like to see a branching MQ too.

Yeah, but since so many people are playing, and people are REplaying, people will find it, but maybe not everyone.