I'd like to be able to remove decoration by context menu, like there already is "fullscreen mode".
Full screen mode would also be ok, if the window would be resizable after.
Then for both full screen mode and "decoration-less" it would be nice to access the context menu by Alt-F3 for example like KDE without leaving full screen mode.
This is easy but would go against the logic of xfwm4.
If the application sets the appropriate flags (e.g xfce4 terminal has such an option) the WM will not decorate the window, but I am against forcing that from the WM.
I know that setting of Terminal and I was a bit surprised to find that setting inside the app on some configuration tab.
That would mean that every application needs this setting on (mostly) different places, eventhough it actually is an attribute for the window manager only. The app doesn't know about any decoration or shouldn't. The app can maybe tell the WM if it is adequate to be resized but no matter what is around the apps window.
Then Xfce is universally supporting different framework apps. Other WM know to remove decoration, so their apps don't have that setting. At least all these apps won't ever get such a setting.