That's an issue with how it is coded in the database.
The limit for a launcher like a VLS is rounds per minute, not interval between rounds.
You are probably playing with the LWAMI Mod using the anti-missile SAM salvo doctrine. In that case, a hold fire interval would have to be coded into the doctrine, and would produce a lot of overhead code and room for errors and possibly problems for a minor enhancement, at least in my opinion.
Now that having been said, Amizaur has said that he sees that problem, and honestly I never have, all my missiles fire in a nice sequence with a short interval of about a second or so, using the exact same doctrine and database, so it may somehow be system dependant.
The good news is that the way DW does its hit testing, it shouldn't matter significantly in terms of the outcome of the exchange in gameplay terms.
Sorry I can't give you a better answer but quite a bit would have to be invested in changing this and it actually wouldn't make a big difference for gameplay, there are so many other issues we have to address (like the torpedo seeker modelling...
). I sound like a producer now...
