Quick question.

I have 5 in an attribute and 5 ranks in a skill. Can I flip a destiny point to add an additional green to my dice pool?

RAW; yes.

Besides the limit of only being able to spend 1 destiny per dice roll, is there any time where you can't flip one to add/upgrade your roll?

No.

Only thing you have to keep in mind is the Story Points spent by the GM and/or Players do not go into the other Story Point pool until AFTER the roll has been narrated. So, if you don't have one before you start building your pool, even if the GM spends one ... you won't be able to use it until your next roll/check. It's a very subtle "step", but it is there.

Z

Cool. Thanks y'all.