To the OP, there is a very good reason why it was removed/never put in.
Now i will say i personally would enjoy if we could launch more then 1 SLF at a time, personally i think we should be able to launch a max of 2 at a time. However, you are not allowed to, due to balance.
If you get a pilot up to elite status, they literally never miss their shots on a craft, how is this broken you might ask your self.
1 fighter, the lance. This little fighter in the hands of a elite rank pilot is a mean little machine, it can solo anything below an elite rank thats a small ship save for a vulture.
And it never misses once. if you would have 2 of these things, it would strip the shields off of most small NPC crafts after 1 or 2 volleys from both of them, and if you are a good pilot, you will be having them target sub systems, and they will literally rip them appart because again, then never freaking miss.
If you could have 2 elite lance pilots that would be pretty much the same as having 2 extra medium turreted rail guns. Even against large ships it would wreck them if you are targeting sub systems.
Now with that said, i would LOVE if we could get a new Hanger bay that let us launch a single sidewinder/eagle/iegale/vulture, and the hanger could only carry 1 of them, maybe 2 if its a large hanger. As canonically the anaconda DOES have a self launched sidewinder or rather can have one. I think having a heavy fighter hanger that held 1 maybe 2 small ships would be really cool.