Jennaker and Jib?

I've been having really good luck using a continuous furler to manage the Jennaker on the 21sc so i'm experimenting using it more often. One the things that I haven't been able to get a feel for is when it's appropriate to have both the jib and jennaker out at the same time. Is there a good time to have both sails out? maybe more on a beam reach than broad? Thanks

In really light air better VMG can be achieved running dead downwind wing on wing. As the wind picks up past 5mph furl the jib and start jibing.

I'd love to see how you have this set up. Could you post some pictures ?