Disable "space+shift" in Sublime Text
On my system I can't reproduce the behavior of Sublime described by the OP. The problem may be related to an interfering third-party app/process.

One possible solution - configuring a new keycode with Karabiner to avoid the problem - is outlined below.

To disable or modify ShiftSpace in Sublime just remap the key combo with Karabiner. Usually you have to define an app in /Applications/Karabiner.app/Contents/Resources/appdef.xml if you want to adjust/modify an app-only shortcut. Since the appdef list already contains Sublime Text you can immediately add a new remapping.


Download, install and open Karabiner
Open in the menulet Karabiner -> Preferences
Open the tab Misc &amp; Uninstall
Hit the button Open private.xml
Open the file private.xml with an appropriate editor
Enter the customized keycode

Example (ShiftSpace -> Space):

&lt;?xml version="1.0"?&gt;
&lt;root&gt;
  &lt;item&gt;
    &lt;name&gt;Enable at only SUBLIMETEXT&lt;/name&gt;
    &lt;item&gt;
      &lt;name&gt;Shift+Space to Space&lt;/name&gt;
      &lt;identifier&gt;remap.app_sublime_shiftspace2space&lt;/identifier&gt;
      &lt;only&gt;SUBLIMETEXT&lt;/only&gt;
      &lt;autogen&gt;__KeyToKey__ KeyCode::SPACE, MODIFIERFLAG_EITHER_LEFT_OR_RIGHT_SHIFT, KeyCode::SPACE&lt;/autogen&gt;
    &lt;/item&gt;
  &lt;/item&gt;
&lt;/root&gt;

Save the file
Open in the menulet Karabiner -> Preferences the tab Change Key
Hit the ReloadXML button
Enable the Sublime Text remapping. It should be listed at the beginning.