I have been using these Custom Rewrite Rules in vBSEO. I think they were inlcuded in a previous version. They do a good job in translating URLs with variables (?do=viewitem&itemid=28) into a static link. For example
http://saabworld.net/classifieds-28/
Code:
'^classifieds\.php\?do=viewitem&itemid=(.*)$' => 'classifieds-$1/'
'^classifieds\.php\?do=searchtimeframe&timeframe=(.*)$' => 'classifieds/new-days-back-$1/'
'^classifieds\.php\?do=addedititem$' => 'classifieds/addedititem/'
'^classifieds\.php\?do=saveupdateitem$' => 'classifieds/saveupdateitem/'
'^classifieds\.php\?do=myprofile$' => 'classifieds/myprofile/'
'^classifieds\.php\?do=profile&profileid=(.*)$' => 'classifieds/profileid$1/'
'^classifieds\.php\?do=myitems$' => 'classifieds/myitems/'
'^classifieds\.php\?do=myitems&tab=(.*)$' => 'classifieds/myitems-tab-$1/'
'^classifieds\.php\?do=mybids$' => 'classifieds/mybids/'
'^classifieds\.php\?do=myhistory$' => 'classifieds/myhistory/'
'^classifieds\.php\?do=myhistory&tab=(.*)$' => 'classifieds/myhistory-$1/'
'^classifieds\.php\?do=searchseller&sellerid=(.*)$' => 'classifieds/sellerid-$1/'
'^classifieds\.php\?do=searchresults$' => 'classifieds/searchresults/'
'^classifieds\.php\?do=approveads$' => 'classifieds/approveads/'
'^classifieds\.php\?do=approvereports$' => 'classifieds/approvereports/'
'^classifieds\.php\?do=certified$' => 'classifieds/certified/'
'^classifieds\.php\?do=addcertified$' => 'classifieds/addcertified/'
'^classifieds\.php\?do=removecertified&memberid=(.*)$' => 'classifieds/removecertified-memberid-$1/'
'^classifieds\.php\?do=contactseller$' => 'classifieds/contactseller/'
'^classifieds\.php\?do=postreport$' => 'classifieds/postreport/'