Pets and Cohorts got shunted into the Relationships tab a while back.
As far as Windows 7 support goes I largely consider it a nice-to-have, but not essential. If an issue crops up that I can't replicate on my dev boxes and seems to be confined to Windows 7 it's unlikely to get much traction, unless another dev looks at it. Historically that sort of thing has just been Windows 7's abysmal support for DPI scaling though, so I doubt anything's likely to happen on that front.