Welcome to WebmasterWorld Guest from 18.104.22.168
(We are using IIS and W3 extended format for logging)
How are you analyzing this information? You must be using something. You'll have better luck parsing it after it's been converted to a usable format.
Microsoft has a free product called LogParser. It is exceptionally fast at reading and rewriting log files. It can process a 100 MB log file in less than 30 seconds. You can parse the URL to be combined, use regular expressions to rewrite them, or run SQL-like commands against the whole log.
If you're using Clicktracks, you could pre-process your logs to rewrite your URLs in any way you'd like, or strip out any users, whatever. Then, analyze the resulting logs in Clicktracks, and take advantage of the lovely user interface.