I made a bug report that didn't sneak into these patch notes about converted hangar (and other fighter slot adding hullmods) not using launch bay weapon slots when provided at this thread, maybe worth taking a look at? It would be appreciated by a few people. Thanks 
I did see it! Ah, apologies, it's not something I really want to mess with, especially right now. It's got potential to add bugs and the use case is pretty limited - and as you note, not present in vanilla, which makes testing more of a pain, too.
Re: Storm Needler, yeah, no argument from me. It's not a weapon I'm happy with - it's just borderline "ok" - and I remember struggling with it when putting it together.
Maybe something precise and flux efficient, with a decent range (800ish?) that has pretty good burst and efficiency, but underwhelming sustained DPS. So kind of like the other needlers, but also accurate. Hmm...
Putting this here (in addition to the other thread) because it’s a pretty relevant thing.
The problem with the Storm Needler is not in the weapon itself. In order to be “good” on the current set of ships it would have to be overpowered. At 800 range and good burst and efficiency with underwhelming DPS it will be just as unused as it is today.
The problem with the storm Needler is the same problem as a Mark IX has. It’s that it’s a kinetic large ballistic.
Imagine for a second a mark X could be fit in a medium slot, would you fit them in medium slots? Probably, yes, if you had large ballistic to work with for HE. The current Mark X is a better gun than an HN almost solely due to its higher dps/op (and range).
So why don’t Mark IX get a lot of fitting in large ballistic slots? Well because a medium ballistic for kinetic and a large ballistic for HE is just generally better than a large ballistic for Kin and a medium ballistic for HE. The HE grants additional returns at the large slot due to the generally higher individual projectile dmg.
This kind of thing happens all throughout the ballistic lineup. Are LAG and Mortars bad? Not in the slightest but you stop fitting them as soon as you have medium ballistic slots because a railgun plus a heavy mortar is better than a HAC plus a LAG. You cannot make the LAG good on cruisers and destroyers with medium ballistic slots without making it OP. You could maybe make it work with non ballistic slots if non ballistic medium slots had really good ways to punch through shields (which they dont aside from sabots, which may be a bit limited for some people’s tastes)
So the storm Needler needs to be paired with slots that are not ballistic in nature. Would you use a storm Needler on a ship that had a large ballistic and a bunch of missile slots? Definitely. Would you use a storm Needler on a ship that had a large ballistic and medium or large or small energy? Absolutely. A storm Needler plus a plasma cannon is better than a HAG plus as plasma cannon. And a storm Needler plus a Heavy Blaster is better than a HAG plus a Heavy Blaster.(or graviton beam) And a storm Needler plus antimatter blasters is better than IRPulse (or antimatter blaster) and a HAG.
The fact that I can easily find configurations that make the storm Needler work indicates to me that it’s not a poor weapon in and of itself. It indicates that ships don’t exist to take advantage of it.
If you could, you would absolutely fit 4 LN on the front of an Aurora for 600 kin DPS out of 32 OP. So if you could you would absolutely fit a storm Needler for 750 min DPS out of 28 OP even more.