I just tried my company's FogBugz sub-domain but for manuscript.com and I was already logged-in. That explains seeing the domain while logging in to Kiln. But,

I just tried my company's FogBugz sub-domain but for manuscript.com and I was already logged-in. That explains seeing the domain while logging in to Kiln. But, very sadly, Manuscript seems to be FogBugz, not just 'based on the engine'. Still no Markdown for one.