Yeah, I point out potential squicks as well. If I'm reccing for a community, I'll warn according to their guidelines -- for example, in stargategenrec I'll mention possible ship (as you do); in stargateficrec I'm careful to warn for character death even if it's a circumstance where I wouldn't normally (for example, a major spoiler in the story), because that's one of the things they require.

I've also noticed, now that I'm paying more attention to it, that I always issue warnings for canon spoilers and also for things that have been "jossed" when I'm reccing older fic (e.g. I just did one today that was written pre-season 4 and contains certain plot elements that no longer quite work, so I did mention that in my rec).