Is there any way that the close tab button to be optional?
The settings applied to whole tabbar, so all tabs will have or will not have closing button.
There is a small trick - all buttons created before enableTabCloseButton command will not have button, so you can use something similar to the next
tabbar.addTab(… //create buttons which must not have closing button
tabbar.enableTabCloseButton(true)
tabbar.addTab(… //create buttons which must have closing button