I can almost promise you 1, 2, 4, 5 and 6 will never happen. Not entirely sure what you mean by 1 but more precise weapon effects are probably unfeasible and at any rates improvements like that can't easily be sold as a feature in a new DLC.   Same kind of thing with 2 and 6. The Devs have basically said turrets will not happen until Sins 2, and they already raised the weapon limits with titans in Rebellion, unless they release a "Mega Ultra Titan" DLC I don't see them raising it again.

Technically you could do 7 already, but the AI would be totally unable to deal with it and would just get their fleet stuck.

I realize this is just a wish list, but a good part of Sins modding is learning how to make use of what you have to make to make features and mechanics that have the overall effect you want. You can almost never get things to work exactly like they do in another sci-fi universe. You can however, do things like simulate antimissile systems by using the PhysicalDamageTaken entity modifiers to reduce the damage your ships take from missiles, and in the ability attribute it to shooting some missiles down.

5 weapon slots is plenty IMO. With how Sins' weapons are set up, you really don't need more than 5 slots.

Once again, I'm talking with reference to Sins' own mechanics. If Sins had a flexible hardpoint mechanic like EaW, it would be a different story. A chunk of Freespace's weapons would be better represented by abilities anyways, such as point defense guns.