First if all, I am making an assumption that the close tab buttons cannot be moved...

Having become used to Firefox browser tabs and some tabbed text editors that have their close tab buttons situated on the far right of the application window I would like to have this optional position available in Kate. Firefox allowed configuration of this option so that users could have the close button on the tabs or on the right hand side of the window as before. The FF dev.s changed the default position of the tab close button but retained the option for the previous functionality.

My other editors also have the close tab button on the far right.

I have grown used to being able to close tabs by clicking on a button that is always in the same position on the far right. It is both familiar and useful.

I have made a mockup of the close tab button in the alternate position.