What version of jwm do you have?
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jwm -v
As noted in the thread you linked to, you will need jwm snapshot 667 or newer to use this feature. You can find a newer jwm here:
JWM Desktop Updates to V755 (Release) and V75? (Test)
I don't know if anyone has tested it with Precise 5.5.94 yet, so can make no guarantees about how it will perform for you.
(Note: You will need to restart the X server after installing a new jwm, so that the new version will be loaded -- jwm -restart is not enough.)