Although very desireable, it's highly unlikely that this feature will be ever implemented in PSPad because it uses a third party editor component which is the one that needs to be modified in order to implement this and other features like the all-time asked code folding/colapsing.
-- <http://forum.pspad.com/read.php?2,60497,60636> PSPad freeware editor http://www.pspad.com
