This is a good point.
I've said things here in the past, about improvements to SEO. I think there needs to be a complette management system for SEO control. It's extrememly difficult to remember what does what to which element. And when you have elements with multiple SEO's etc.
I would also suggest SEO get two options added. Live SEO, or Manual SEO. Ie once you've done a SEO, it will stay like that if manual has been chosen. And only updates with a manual "update". This would probably be most proactical for your situation.
Personally, SEO is one of the best things to come to ArchiCAD for a long time. Now waiting on the "next big thing".
James Badcock
Graphisoft Senior Product Manager