I haven't added a sitemap to Google Webmaster Tools before because I was concerned since not all of my new material gets added to the sitemap of my site. I was afraid Google would concentrate more on the sitemap than crawling the rest of my site and end up missing this new material from my site.
If you add one or more sitemaps, does Google Bot crawl rate go down or do they still try to find new/updated material the old fashion way?
[edited by: aakk9999 at 12:06 pm (utc) on Dec 12, 2013] [edit reason] replaced "site index" with "sitemap" to make a question clearer [/edit]
google is pretty good with link discovery. make sure googlebot doesn't discover non-canonical urls in your sitemap and you should be okay. perhaps more important for link discovery is a good internal link structure and external links to your site from relevant and authoritative content.