I'm trying to get full 1920x1080 30p footage to export from Premiere CS5.I can't modify the MPEG2 Blu-Ray or H264 Blu-Ray presets to get this combination. I need this footage to be .m2v (mpeg) or .mkv (h264) in order to import to Encore to make a progressive Blu-Ray disc.

Any help would be greatly appreciated!

No, 1920/30P is not a legal BR format.

You can see the frame size and frame rate combinations possible for BRD here:

Blu-ray Disc - Wikipedia, the free encyclopedia (http://en.wikipedia.org/wiki/Blu-ray_Disc#Codecs)