Theres always swarm missiles imo (auto lock).
But if you want staggered missile-beam ones, then yes there are ways.
First of all you create a ship that has low power storage and high power regen, then create a beam missile system with lots of deccently powerful outputs (or use a few computers for this).
After initially firing a few missiles and using up all your energy, it will then fire another missile as soon as it has enough energy too, thus you are firing one missile every 0.3 seconds or so (depending on how youve built it). Depending on the number of out puts you can be outputting a steady stream of missiles like this for 10-20 seconds (and boy does it look absolutely beautiful :3).
You could alternativly use a ship with high power storage, but use another weapon to drop your power supplies before firing your missile vollys.