I will try to clarify it again.
Lawless trade route:
Such a route would add the possibility of a real encounter, during a trading run in a group. In this group, you can gather many kinds of characters, as everywhere else i think but the difference is, that a fight at the end will definitive brings an end in a fight. An end for the traders or rouges. If the rouges do a little bit RP before engaging the trader group isn't important, cause both "teams" got their destination. RP in each group is doing well and everyone's having fun. But they know, that they can be ambushed by rouges, that danger gives that situation more action, reality, maybe adrenalin.
Secured trade route:
Same es before, but you can't loose (what's very strange in a game). You don't even have to form a group, cause you don't have to be afraid of been robbed, or even killed on your run. You're doing some RP with the rouges, give something to them, cause they can't kill you and steal you whole stuff and they will never know what you're trading.
My personal sight of the PVP part and how it's handled in PS:
For me RP and PVP should never separated from each other. Anyways, both got their fans. Some want only RP, some only PVP and that's... Bleh to me you know? I could take thousand examples of only RP or only PVP or even only PVE games and that's all bullshit. Only the combination of those parts can make a game really great. There's no fun forever killing monsters, looting stuff, selling it and sitting on all that gold and stuff. Further, there's no fun with only PVP related games. You kill players 1000 times, get killed by 1000 players. Only RP (ohhh i will antagonize many people now... ^^) sucks too, cause i'm talkin' 2 hours of gameplay without getting dynamic fighting action. It seems that most people just don't understand, that a balance between things, make those really great.
Don't get me wrong, i really like PS and have already spend some hours with making friends, helping others and so on. It's OS and runs well (except on my Fedora 12 but WinXP so i don't care that much ^^[It's a driver problem for those who care]) and PS got sh*tloads of potential. But the balance isn't well, like i've already suggested. So i'll suggest to change things, a bit at a time.