close speed dial tab when not allowing windows without tab

I use Opera with the following configuration
1) Start with speed dial
2) Use windows instead of tabs
3) Don't allow windows without tab

I noticed that pressing <ctrl-w> on a window containing one "true" tab
(not speed dial) close the tab and the window and I like this behaviour.
However, I don't see any way (from opera) to close a window containing
only the speed dial tab (ctrl-w does not work probably because of 3, and
ctrl-q will close every window not only this one. Is there a way to
close such a window from Opera (I mean without a clic on the cross,
using the window manager)?
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