2 different scripts
lol make that 3...I've got one functioning right now...it uses the invis targets already in the BAS Tonal Addon (which if you do not have this...you should smack yourself soundly)
There are actually a few separate scripts for different types of covering fire, one uses invis targets spawned roughly halfway between the firing unit and the target that shift location along a randomized arc every second or so (spray and pray type)
The other one uses a precisely positioned invisible trarget and some math to create realtively accurate cover fire over potentially Loooooooong distances for units like enemy snipers and mgers (at 1000 m the rounds from HD units sprinkle the target area quite nicely but not tooooo ridiculously accurately) ...It also incorporates a feature where the firer's aim can be 'augmented" by the script, so that each shot has a user definable chance to be assisted right at the target (to model aim refinement and spotting). This basically will delete the bullet and camcreate one setvelocity'd right at a member of the target group. So to the target, it ends up looking pretty natural.
-Grendel