The file in question is pickup_shake.lws. There are two special nulls, Start_NULL and End_NULL. Take a look at this picture for locations:
Look familiar? Start_NULL is where the raider is put to be picked up, and End_NULL is where he lands. I think this is no more difficult than moving that End_NULL several squares away and then changing some of the monster's stats to make it act like a cannon. If anything, this will let us see if it's possible and we can worry about visuals later.