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Firefox supports something similar, if you for example visit IMDb you can add their search via the Firefox search box and then add a keyword of your choice to use the search in the address bar.

Both Firefox and Chrome use OpenSearch (http://www.opensearch.org/Home) to achieve this.

That sounds a lot like you're still creating each one yourself. Just because Chrome is suggesting that you might want to create a search shortcut, doesn't mean you're still making individual shortcuts by hand.

I can directly search Audible.com (a site I've never used before) with an intuitive !audible. Then I never have to think about this shortcut ever again, because it isn't saved in my browser somewhere.

If you delete the suggestion by hitting Shift-Delete while it's highlighted.