For each additional Streak launcher on a firing circuit, it requires an additional second to lockon.
Now, this is something that would make 2-3 Streaks still playable, but above that, lockon times would really reduce the rate of fire. (After all, the data needs to be updated to the missiles constantly until they are fired).
Add in a breaking of lock after missiles are fired (clearing of buffer data?), and you get Streaks still being extremely useful in small numbers for self-defence, and light mechs (ammunition and heat conservation).
Given they are looking at multiple weapons of the same type in the same location generating more heat (which is a function of the hardpoint system, and beyond player control), I think the extra time would be reasonable, and more balancing.
ATTENTION: I have reread the actual Solaris VII rules on this. They did actually state it is a +1 penalty to the target number per extra launcher, not a time penalty. I am sorry I mislead people. However, that said, because Streaks do not fire without a lock, this does translate well to extra time being required for a lock, and my original recommendation that PGI look at this stands.
Edited by Voidsinger, 25 November 2012 - 03:17 PM.