Custom priority and frequency for specific posts or pages

I was wondering if it is somehow possibly to fine-tune the priority and frequency for specific pages of my blog? I saw that individual pages or whole categories can be excluded, but could not find something like this in the plugin settings. If not, perhaps this would be an interesting addition for the next release? One of the ways to achieve this, without cluttering the plugin settings page, would be to use the custom fields.

Just to give you some background info why this might be interesting: we’re running an event calendar site based on WordPress with the Event Manager plugin. On the site, the event calendar pages are the most important ones, blog is less important. The event calendar pages (calendar, list of upcoming events) even if they are static, are generated dynamically – and the list of upcoming events changes daily, as each day current events are moved to the archive of past events. So I’d like those pages to have a priority of, say, 0.9 and the frequency “daily”, without affecting all pages of our blog (like contact, etc, which rarely ever change, and are less important). Something like this would be nice to have!

http://wordpress.org/extend/plugins/google-sitemap-generator/