The xterminal apps have a menu option to hide window borders, it'll be a very
cool feature to add to xfwm.
With the fluxbox WM for exemple, it's possible to Toggle the decor of each window.
It'll be very fine to have an option in window-menu and a shortcut too
Steps to Reproduce:
Nope, sorry, there will be no per window settings in xfwm4.