In watir-webdriver this can be done by editing the file: C:\Ruby193\lib\ruby\gems\1.9.1\gems\watir-webdriver-0.6.1\lib\watir-webdriver\elements\option.rb and before how to choose def add this:
def enabled? !disabled? end
Did this work for me since watir-webdriver doesn't know about .enabled ? for select_lists options.
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