Would I? Yep, I totally would.
Give a little slack, get a little slack. Name of the game.
Were I completely and slavishly devoted to the concept of my character, I'd be floating off on my own over the ocean after having blasted a library into pieces and located an atlas with a big "YOU ARE HERE" tag.
But since my character serves me, and not the other way around, I decided to mitigate that basic goal in favor of actually, y'know, having fun. I can justify it all I want. Maybe Omega's discovering that it likes having people around that it isn't compelled to vaporize. That's a new thing for it. With that, its normal drive to fulfill objectives is...less than it might otherwise be. Especially since its current objective is self-administered and admittedly rather vague, based on oodles of missing information and attempts to shove round commands into square circumstances.
In short, its objectives are flawed, and Omega knows it. So it's hanging with you guys while it tries to figure out how to fix that. Omega wasn't designed to figure things out though...it was designed to go and go and go until it couldn't go anymore.
...
As for our marilith, nothing wrong here that a round of chill-pills can't fix. Even if you want to play her really really evil, even evil people will cooperate with others if it serves their interests. And this dude she's kidnapping...it doesn't seem like he's so valuable that she'd throw away goodwill and trust just because she wants to take him on a magic flying voyage. If the mouthy bard wants him, let her have him! You get brownie points for being so kind and reasonable...all for giving something up that you don't even care about. It's win win. And by win win, I mean you win...twice. That's the Evil way.