I've managed to solve part of your problem.
To get a unit to grab hold of a dead unit you need to use the following line:
[deadunitname, draggingunitname] exec (slx_wounds_path+{drag.sqs})
However, once that is done I can't manage to get the units to move anywhere!! I've tried waypoints and "domove" commands.
I'm quite new to scripting too but I bet that there is another command to get them to move. I found the drag.sqs in the following location -
@ffur2007 \ addons \ SLX_wounds
There are loads of scripts hidden in that file, I'll bet your answer is somewhere in there!
EDIT. Not sure about this, but you'd probably have more replies to this if it was posted on the scripting board???