Just off the top of my head....
I assume you are talking about editing recordings rom a DVD-ram disk. First you need your PC/MAC to have a DVD-ram dirve capabable of playing a 4.7g DVD-ram disk (mounting usualy is via something like UDf instawrite from VOB. Second, as far as I know PowerDVD VR will let you play the MPEG2 (.vob) files that are recorded by the panasonic dvd set top and dvd-ram camera recoders. Other software to check out is UleadVideoStudio5 SE VR, which lets you edit, but I think that it is also packaged with some sort utility for mounting like the VOB instawrite suggested above. i do not know much about different flavours of windows and compatability......
I dont know about premiere.... but you should also check out
http://www.heuris.com which has a project called the DVDConnexit plugin for Premiere which according to the site is designed to do exactly what you asked about..... I wish they would hurry up and deliver as I have been waiting for almost a year for this very thing myself.
If you check the site and are interested you should drop them an email and help hurry them up!!