Enable close tab with isClosable == true even if showCloseIcon == false

With the global setting settings.showCloseIcon set to true, I'm not able to close anything. Both the close button in the header is hidden and the close button on all tabs. To me, it makes sense to show a close button for each tab with isClosable == true, even if the global showCloseIcon is false. What I really want is to hide the close button in the header, but still be able to close tabs with isClosable == true.