Well, I know how alternating sites work: you have an Attachment Method (on the tab) with a driver (the effect that causes it to switch) and an uh... set of attachment points or something. So you can alternate between weapon00 and weapon01 by picking the right attachment set. How you'd expand this to attachment points on attachments isn't clear...
Maybe we can somehow stripe the events so the beams go off in sequence... :)
One thing, though: I have 3 attachments and I'm trying to get all three to shoot beams at the target of the attack. They correctly play the attack anim, but the launch model and the beam only appear on one of them even though I did copy the attack actor 3 times and all 3 are supposed to go off when the same event triggers; the only difference between the 3 is which site they use.
When I cycle the sites between them, different attachments emit the beam, so the sites are all valid. They just don't go off all 3 at once.
Also, is it possible to somehow apply a Thor-like effect where the unit alternates which attachments shoot? I know about the attachment method tab but there doesn't seem to be a direct way.