Actually, the recently updated macro does allow you to exclude spaces by including a minus/dash before the spacekey. So if you want all spaces except myspace (spacekey: MS) then just put "-MS" in the Space(s) box. You can exclude multiple spaces with a comma.
This is listed right in the documentation:
I tested the recently updated macro on Confluence Cloud and Confluence 6.2.3 and in both cases I could exclude the current space by specifying -<spacekey>. Please let me know what version of Confluence it is not working in for you.
Thanks to Stephen for checking the docs to find this parameter; I should have done that before answering.
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