What more do I want? well for starters, a neutral investigation and a fresh report as demanded by the courts would be nice, don't you think?
Let me state explicitly that I am not doubting the report of CAA and I too believe (as per report) that the Pilot's behavior was...well, unprofessional... to say the least. However, investigation reports do not (rather, should not) end at that. The purpose is not only to find someone to blame but to study the events that lead to the crash with the aim of improving standards, and thereby possibly preventing such incidents from happening in future.
For instance, what does the report says on the reasons of the Pilots behavior? Is there any study of how often senior pilots exhibit such behavior? did the crew go through a CRM training? if yes, did it yield the desired results (I am afraid not)? Was the training lacking? was the material inadequate? or are our cultural norms so strong that such a training will have little effect? And what ought to be the solution for such behavior will not be limited to only this crew (or for that matter this airline and this industry).
Secondly, what are the procedures for ATC communications? Are they adequate or need to be upgraded/improved? If the radar is showing the pilot going astray while he still claims he can "see the runway", does ATC stop at that or tell him(pilot) that he is way off course, particularly when there are so many NFZs near Islamabad? A study of how often pilots tends to ignore ATC communications would be another starting point, and why?
There was a crash ( i don't recall the flight number off my head) in which the crew "forgot" to extend their flaps during takeoff. The NTSB report didn't just stop at blaming the crew but a thorough study, involving NASA experts, was made that resulted in upgrading different check lists with the aim of making them shorter, more logical, and less likely to be overlooked/missed.
A neutral body will in no way help contribute towards the length of the report by addressing the issues you wish to see addressed. If foul play was suspected, or the sequence of events was miscontrued in some way to make it seem like something it wasn't, then a neutral body would have been necessary, but in this situation, its clear as day what happened.
What you have seen is purely an investigation report, where they have told you what has happened, nothing more. The relevant bodies can now go about dissecting each and every event, figure out why the environment on the flight deck was so hostile etc etc, and present a cause-effect report type of thing, and THEN, bring about any changes, if any are needed..