If those boxes are Dell, AND they have Dell's OMCI installed, THEN you could implement this custom mof edit:
http://myitforum.com/cs2/blogs/skissinger/archive/2008/09/27/dell-omci-smbiossettings-hardware-inventory-extension.aspxto pull in WOL settings for Dell business-class computers.
Unfortunately, the WOL settings aren't in "default" WMI settings. So they have to be gathered via individual vendor-related tools, if they offer them, like Dell does. I think IBM/Lenovo and HP might offer ways to pull that information out, but I don't have any IBM/Lenovo/HP in my lab to confirm that, or to create custom mof edits to offer to the ConfigMgr community without someone to run tests in *their* lab to confirm the custom mof edit is useful.
Standardize. Simplify. Automate.