It's the second option on the first tab (Data) of the item editor, right under whirlwind direction. Not sure it'll do anything, but it's worth a shot.
EDIT: Otherwise, I'd say try upgrading to 2.50 or 2.50.1, but that might cause other bugs and inconsistencies... But, once you got them all hammered out, it would probably run smoother than 2.10 does, since 2.10 is such an old version.
Edited by Lineas, 07 August 2013 - 08:37 PM.