Well, I have played Jumpgate, a space ship sim that's quite some time around now. To the time I played on the european server there was quite some roleplaying around especially in the Quantar faction (Yes, my forum and often game name has its origins there). Though that server doesn't exist anymore. How it's today on the world server I can't say. As I took a look a good year ago there was some basic RP going on.
Another game I played was Neocron. The game has flair and would be a good base for RP and I heard on the now nonexistent french server, as 'external' server run by AD, was some RP going on, but quite a number of the current playerbase lsound like RP haters. The game is only slowly developed and has quite some problems.
In Face of Mankind Beta there was some basic RP going on even its fast paced 1st person combat, maybe because of the 'order and wait' production part not unlike seed and a 'we are the faction'-feel. Though I never managed to play gold version and big parts of the game got redesigned. During Beta the small Dev team, mainly the boss and maincoder duplex, was nice to talk with and really looked like he 'nows his code'.
The time before Seed I spent in Dark & Light. Well, a nice dragon ride simulator with a impressive landscape and view, if a game has technical problems it's this one. The good side are the events by AD. Players are the usual MMORPG mixup, only there this group here would clearly have the advantage of numbers because the playerbase seems to be smaller than Arash's ignore list in SoR. It has some potential but quite some work has to be done. Given the current development speed it's worth a look in a year or so, though maybe it's a typical 'asia grind' by then because biggest supporter and taking over more and more design work is a chinese company.

The games I decided not to play are for one WoW. Tested it but and well, disliked the look and feel, and basicly only looking forward to a lot of grind, even this time behind some quest cover, doesn't helped either. Testing Eve I had mixed feelings. I liked the setting, I really enjoyed playing games from Elite over Wing Commander and X-Wing series to Jumpgate after all, but I never got used to that 'being the ship' feeling. Because of that there always was that feel of distance and I never managed to 'get into the game'. It's just me, can't even really enjoy a driving game without cockpit view.