We are working on this and it will soon be fixed. This information is very useful for visitor analysis. Some of the older browsers pass incorrect or insufficient information to the server. This may cause results to be influenced a bit. For example Netscape 3 does not report the Screen Resolution of the client machine.
Server logs have their limitations too.
Total Hits tell you how many times the page has been accessed. A single visitor can return to your home page many times. While Unique Hits tell you how many unique visitors came to your page. In nutshell, if a particular visitor returns to your page with in half an hour of the same session, he is NOT a unique hit. However the Total Hits go up by 1.