Hello Sławomir Grochowski, Thank you for your interest in this topic.
Clocktables are generated tables that are completely replaced each time they are regenerated. This means any of the normal table customizations that a user might want to perform, like setting the column narrowing or adding a table formula would be lost. For this reason we allow those customizations to be specified in the arguments to the clocktable. Other then the issue of user changes being lost, the clocktable is the same as any other org table. This means users can call normal table functions on the table such as `C-c <TAB>' (M-x org-table-toggle-column-width). That function expects to find the narrowing value in the table itself. For this reason we must add those customizations directly to the table even if that might seem a little redundant. You can read more about how table width works in the Org Info pages: [[info:org#Column Width and Alignment]] Let me know if you have any more questions. I'm closing this feature request Canceled. Morgan
