Oops, forgot to post an update here. The WOL client has been updated to more efficiently handle the new fields.
At the time of writing, v5203 is the latest client version. This version is shown in the Help > About dialog since v5202, like this: http://snag.gy/ujuq9.jpg
If your client is not showing a v520X version number or shows v5202, you can force Java WS to update by clearing the JWS cache: viewtopic.php?p=9199#p9199