And I think a lot of that comes, actually, from interacting in fandom...read a lot of good Xander slash, and you forget Xander's not gay (or at least out of the closet, as some would have it!) in canon.

Interesting point! Reading fanfic has definitely impacted - positively - my view of characters in the Jossverse, so I can see it also altering our perception of the characters when we write fanfic. I've read Xander slash that doesn't address the not-gay-in-canon issue which is really good and in character. However, in my writing I love figuring out how Xander would get to that place where he'd even consider kissing Spike (for example).

Plus, when I'm asking myself that, and thinking about how the character would get to that point? It feels like I'm watching more of the show in my head.

I do that as well! I always have a visual image of my fic (even if they're just sitting and talking), and it does play out like part of the show.

What do you write scripts for? For fun? Professional? *is nosy*
Not professionally yet. We would like to write for television professionally but are still working on breaking in.