Not a simple one. To make a specific tab open one would need to add something to the URL and then read it from the URL (for each tab). Then one would need to read the URL (when processing in Zen Cart), determine a tab needed to be open (and which tab), and then generate the appropriate code to show the correct tab open when the page is loaded. Next one would need to replace all of the URLs generated by the reviews template (to add which tab needs to be open when).
Not saying it cannot be done (work may already be in progress to allow direct links which open the page with a specific tab showing - in a future version). Just letting you know this is not a simple change and may require someone talented in HTML, PHP, CSS, and / or JS to implement such a feature.
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