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BUT, the fact that you are using templates tells me that the whole site is roughly based around the same idea. eg, the product or service you are offering.
If you are for example a web designer, you can have around 15 keyphrases the same on each page, and just be more descriptive in your title tag which is editable.
Also, remember that some search engines, including google, apparently don't even look at your keywords, they concentrate on the title tag and the text in the H1 tags, among other things.
I regularly built web sites with dreamweaver templates and i still get good search rankings. Experience has taught me that content is king.