How to change keyboard shortcut for "log out"?
You could try changing ⌥⇧⌘Q to ⌥⌘Q with KeyRemap4MacBook.

&lt;?xml version="1.0"?&gt;
&lt;root&gt;
&lt;item&gt;
&lt;name&gt;test&lt;/name&gt;
&lt;identifier&gt;private.test&lt;/identifier&gt;
&lt;autogen&gt;--KeyToKey-- KeyCode::Q, VK_OPTION | VK_SHIFT | VK_COMMAND, KeyCode::Q, VK_COMMAND | VK_OPTION&lt;/autogen&gt;
&lt;/item&gt;
&lt;/root&gt;