If that works then use it, but keep in mind that you'll only be able to use the plugin for that specific section. The real problem is with changing your URL structure though.
The built-in method for migrating old URLs is to add the code to your articles' intro text to specify the different URL to use, but you'll have to do it once for each article.
| Code: |
{socialbookmarker}sburl="http://www.yourwebsite.com/url.htm" sbtitle="The title you want submitted to the Social Bookmarking websites" sbdescription="Description of this content."{/socialbookmarker}
|
See the plugin information page on this site for the exact code to use. If you have time to do add that code to each article then that is what I recommend instead of the code change you made.