There might be an easier way to get clouds but the problem is, I don't know which smoke graphic Oliver used.
All you need to do is open GeniEd, look for Stormy Dog (or FLDOG since they are some of the flying units that people rarely use) and change the unit speed to something lower. Then change all the graphic of the stormy dog (or FLDOG) to the graphic of the killed projectile.
Or, look at this picture.Edit: Don't forget to unlock the unit in game if you used FLDOG or something else.
[This message has been edited by Night life (edited 07-13-2006 @ 04:34 PM).]