Farscape was a T.V show on the old Sci-Fi channel that ended with the Peacekeeper Wars in 2004. Here's what I think they could do to expand on it:
Farscape: Before Moya
I think it would be great if they could expand on the characters' early years. How were they when they were kids? What led to them being captured by Peacekeepers? This should include their family members (parents/siblings) and possibly what they thought of the other species before they met each other. This could easily be a series of movies to explain each character in detail. They definitely aren't simple enough to just make one movie.
Farscape: The Second Crew
I think that it would be interesting to see the crew's kids on Moya. Put it in today's time and show how the kids have grown up. Deke would still be a child, but Jothee would be an adult. Maybe show other crew members and their children/younger relatives? Even if they didn't have children of their own, they must have nieces/nephews/cousins. It would be amazing to see how they adapt to the lives their parents had.
Farscape: New Worlds
It would be amazing to see the home worlds of the crew and go into detail about them. That was what started the whole thing, wasn't it? And what if their kids (as explained in the paragraph above) visited them? This would be a really cool movie, explaining the alien planets and species as well as the stories of the children of the original crew of Moya. This could also be a series.
Overall, I think they need to save Farscape; they need to bring it back. So many people were upset with its departure from the Sci-Fi channel, and there were many question that they left unanswered. It was an amazing show, and they should honor it with a Cinematic Universe.