This ARTICLE has several links to threads, and articles on working with Camtasia, CamStudio and FRAPS footage. Some of it is probably a bit old now, but I would pay attention to the Replies and comments from Jeff Bellune, as he uses Camtasia (a similar, though different) video screen-cap program.
Not sure that he's used FRAPS, or even experimented with it, but his material on Camtasia, might be useful.
Hope that a heavy-duty FRAPS editor will also weigh in with specifics, and especially for the most recent versions of PrPro.
As long as you captured the screen in 1080 and the codec is standard then any of the 1080P 30 frame or 1080P 60 frame presets should work. The only time I have seen issues with the screen capture material is when someone captures material in non-standard resolutions with a codec that is also not standard to editors. This happens far more often with Camtasia than Fraps.