1. Bake cupcakes for: Lister. I mean, my other choices include a hologram, an android, and a being who evolved from a species that licks its own butt. And you already said Kochanski. Lister's tastebuds are pretty much shot from all the curry, but he could deal with cupcakes better than the majority of his crewmates.
2. Trust with the keys to my car: Kryten. I have every confidence he'd treat it well.
3. Put thumbtacks on the chair thereof: The Cat, just to see if he'd be more worried about his backside or his suit.
4. Have a crush on: Oh god, do I have to?
5. Pack up and leave if they moved next door: Rimmer. He'd never stop asking you round for a cup of tea and an interminably long slideshow.
6. Vote for President: I had a Rimmer for President icon for a while, way back in 2004. The icon is lost, but my explanation (http://catslash.livejournal.com/85421.html) remains.
7. Pick as my partner in a buddy movie: Lister. We'd just hang out and chill. It'd be a boring movie, but whatever, I wouldn't be stuck watching it.
8. Pair up: Rimmer/Lister. Is there any other ship?
9. Vote off the island and into the volcano: Kryten. Oh, what? I'm sure he'd be fine. We can always go back and pick him up.
10. Wheedle into fixing my MP3 player: Ace. He can do anything. What a guy!