Changes column when compare sites

If we have multiple report suites with similar implementation we can acutally use 'Compare site' feature in Omniture. Pretty cool feature.

But one thing is pretty useless and annoying. Change column does not make sense in every case. For example if I compare my main site with mobile site, I don't want  my users to see this column. This number confuses them. Is there a way to make it optional?

thanks