The weather should definitely be optional so the people with slower computers or slower internet don't have to lag as much but Day/night time cycles should not be optional since they affect a lot of concepts in the game . For example the Oozaru transformation at the full moon...
(yes I know Oozaru is not available as a transformation, I'm talking about the time quests like the one where you have to fight Ape Gohan and stuff.)

:cool: I reckon day/night and weather would be pretty cool in DBO (while not being in time quests), it'll totally add a bit of funness and realism to the game.

Weather is a simple thing to add to a game. Each area would have a weather timer when it rains and what not. What I would like to see is seasons for each area and how they are in the real world.

For example New York there are 4 distinct seasons with a hot summer, cool fall, cold snowy winter and a warm spring. Make that like a bigger city in the north.
While in Florida the summers are hotter and the winters aren't as cold. Something like that would bring a huge immersion into the game.

Yes, and as I said before, wearing special clothes for special areas like Snowy ones, or really hot, would be even better.