They could be. I mean, unless you're an animator, how would you know?
Frankly, I think it'd be neater if, instead of a double-beam sweep, it was like, I dunno, a twin charge beam hit. Maybe like a one-two charge beam shot or something.
Not saying it'd be easy to animate, mind. Just thinking of what'd look interesting, visually. We already have weapons that do rapid fire shot sweeps.