Not easily, since it'd require reworking of a lot of stuff. Part of the problem is that Opus can override double click actions, and it's also complex (and not really documented) to work out exactly what the OS will do for each file before actually doing the standard action.
Changing this would risk breaking several other things, so we'd be reluctant to do so. I'm not being lazy here btw, I spent an entire day looking at it last week before deciding the workaround script was a better way to solve the winamp problem.