The Title parameter, WT.ti, supports a single page title per page.
WT.ti
WT.ti=Title
The HTML title of the associated web content. If this parameter is found in parameter list, the value is used in the reports. When present, no other page title lookups are performed. The maximum length for Title is 1024 bytes.
WT.ti always overrides other methods of page title lookup. In a case where two different pages (both having WT.ti) end up being rebuilt to the same URL (via URL Rebuilding), the last page seen wins.