WPMU Dev SEO questions and concerns

Hello,

So i tried this yoast guys plugin. I hate how he embeds the crap out of everything with his own site. Guess it helps seo of his in over 500,000k installs. He also likes to call people names in blog posts. Silly.

One thing I notice though, it wasnt multisite friendly. Things appear even if you disable view from site admins.

So I am thinking of jumping back to the WPMUDev Seo plugin, but I have some concerns

1) I noticed robots - esque options in various areas, where do you guys store this data? In the meta of the page?
2) When are sitemaps regenerated/updated? Is this a daily event, or?
3) Have you considered adding functionality to allow custom priorities to be set on articles/etc.?