Temporary in the 40k universe could literally be decades if not hundreds of years and that's just taking into account warp travel shenanigans... That's more than enough game time to cover most campaigns.
Of course the Squats still exist when I run games so...
So, you wouldn't let me play a Half-Eldar Space Marine Librarian in your game Traejun? /sadface
Fair enough re: time. Temporary could still be many centuries, or even more. So, that is a fair point.
Squats exist in mine too. Though I hear GW may have retcon'ed them back in.
And, no, bro... no half-Eldar Space Marine Librarians. Half-Ork maybe...
Uh, I have no idea what your demands are to consider it "permanent"; I would consider an agreement between a Rogue Trader and a Chapter to be pretty darn well "permanent".
As for wanting to be a Space Marine being "a lack of ability to roleplay" and a "lack of creativity" just because the Space Marines is one of the most well-known things among 40k fans.. seriously? If anyone seems to be lacking the ability to roleplay, it's you, for not even being capable of envisioning the multitude of ways that this situation may come about.
It's only a lack of roleplaying ability or creativity if you are incapable of creating a character as it's own character; a Space Marine is no more "just another Space Marine" than a guardsman is "just another imperial guardsman".
I shudder to ask, but in your mind, how would a space marine really act "around/towards anyone that isn't the RT.
"? I fear for the answer, but I just have to ask.
The first part is addressed above. I suppose "permanency" loses some of its meaning in the 40K universe.
As for the rest, we simply have to agree to disagree. Actual RT careers (plus the many xenos options) provide plenty of room for creativity in character creation and roleplay. In fact, there is more depth to RT PC's than any other FFG system, though that is just my opinion. Needing to bring in a Space Marine smacks of a lack of the above. Again, that's just me... and probably anyone I've ever played with. Hell, the RT in my last campaign was annoyed that someone wanted to be an Eldar.
Then again, I tend to play with people who dislike special snowflakes as much as I do.