The problem, once again, is that we are talking about a right rather then a job qualification.
An individual has a right to self-protection, and the right to carry what could reasonably equalize a threat (which in the case of a lethal force circumstance, particularly a gun or knife weilding assailent, a gun is the only thing that would adequetly suffice). The public has the right to not be endangered by people irresponsibly or unsafely carrying firearms. Therefore, a licensing requirement that entails minimal safety and legal standards and NOTHING MORE fulfills the objective of due dilligence to the public with minimal infringement on the individual right to self-protection.
Anything more for licensing standards (like target qualifications or 40 hours of training) wrongfully infringes on the individuals rights to self-protection, while doing minimal to ensure the safety of the public in excess of a standard safety course.
The reason is because in a minimal safety/legal course, the participant will be given all that they need to know to keep the public safe. They will learn not to put the finger on the trigger unless shooting at the intended target, to only point the firearm in a safe direction, how to safely store and carry the weapon, what legally constitutes "brandishing," and so on. So, even if they aren't particularly skilled with a firearm, there is no reason to feel "uncomfortable" about that lack of skill because they know enough to not put you in danger through improper handling.
The reason why slapping on additional standards is ineffective is because, once again, by who's standards are we going by? The fact is, just because one spends 40 hours on the range, that doesn't mean that they are less likely to hit an innocent bystander on accident in a shooting, or handle a gun any better. What habits one decides to develop for general handling, or how someone will perform in combat is very individualized, and cannot be ensured even through extensive training and qualification requirements.
It would behove you to know that the stats for police officer involved shootings state that they (police) only hit what they are aiming at 12-18% of the time in any given year. This is compared to around 90% hit ratio's on the range. Also, most officers who are killed in shootings are killed in under 10 feet (75%). As far as we know, civie standards, who have no qualification requirements, seem to be no better or worse in terms of performance.
http://www.policeone.com/writers/columnists/PoliceMagazine/articles/77165/
This means that survival in a gun fight, and the ability to hit what you are aiming at is independent of 30 minutes, 5 hours, or 100 hours of training at the range. This is because the range is not combat. Most shootings happen under 3 yards (75%), with about 90% under 7 yards. So, it is not accuracy at the range, or simply "time in" at the range that will ensure ones accuracy in a gun fight, and safety of bystandards. It is going to be how the one handles the total package of "combat" at the given time of the incident that will matter, which no statewide qualification standard could ever ensure.
So, if we can't ensure accuracy and performance in a gunfight for cops, who we trust to protect us on the street and who have training and qualification requirements, how can we ensure this for civies?
We can't.
So, to make a statewide requirement for civies to try to ensure "skill" is completely unreasonable, given this information. It is up to the individual to ensure their own skill. The individual cop, or civie that carries, has to do what they need to ensure combat readiness. This will vary per individual, making it impossible to legislate.