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You would more than likely lose more than you would gain by migrating to a more keyword friendly domain name.  I think Google is going to only downgrade the importance of keywords in domain names from here on out.

I agree with Marcus - if you are creating new urls and articles - keyword rich urls can deliver some added value but are overall of lesser importance to other contributing page factors. -Phil

Crawl notices are just that; notices. You should be aware of them but I haven't seen any notices in my campaigns that would be something that needs to be fixed. I would focus more on errors and then warnings, in that order. Those are the items that can hurt you most when trying to increase your site(s) rank. Hope this helps!