Just to clarify, since a couple of posters have questioned this:

I absolutely have no problem at all with Cmd+Q getting passed to the remote session. That is the intuitive behaviour when operating the remote system.

However, Cmd+Q – whether issued on a local machine or to a remote session – should absolutely not quit Software Update whilst it is installing updated files. Note how the 'installing' window (the one which appears when copying files during the reboot phase of the update) does not have a clickable red Close window widget. This suggests that the coder's intention (and, indeed the correct behaviour) is that it should not be possible to halt an update mid-install. Clearly this is a critical point where interruption can lead to a broken system. The issue here is that even though the UI indicates the process cannot be interrupted, the window still responds to Cmd+Q, upon receipt of which it does indeed quit mid-process.

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