Hi,
Not sure where you saw 12.2(37) i.e. without the "SE" at the end, as far as I know there is only one version - the IOS12.2(37)SE
It does support WCCP, as follows:
http://www.cisco.com/en/US/products/hw/switches/ps5023/products_configuration_guide_chapter09186a008081df96.html
Note that WCCP is a new feature in this release and a lot of the docs (even the feature navigator) haven't caught up yet and still say it's unsupported. And finally, you need at least an "IP Services" image to get wccp support.
HTH
Andrew.