First of all, rafi, let me respond to what I feel is a flaw in your response.
If you eliminated all the soldiers that (voluntarily) joined, even just little bit, in order "to go home with a rifle", or for the honor, or kavod, or whatever, I would venture to say you would probably lose more than half the Israeli Army. "Mitoch shelo leshma, ba lashma"... speaking as someone who has been a member of several Jewish social organizations, 0% of people join for truly altruistic reasons. Everybody has their own motives. What makes the difference is if they can carry their weight. Of all the soldiers who joined to "carry a gun", i'd bet you would find many who rose to the occasion when the occasion called for it, as well as many who joined "for Israel" who ended up giving less than all. Furthermore, I'd imagine those joining just for "gun and fun" wouldn't make it very far in combat tirount. If a soldier can make it through all the 30km Masaot carrying stretchers in Tironut, I find it hard to believe they would suddenly lose that ability in combat.
I am not in a position to question your boots-on-the-ground experience, but I don't know if you inidividually interviewed all the underperforming soldiers to discover that they, for the most part, joined for fun. Furthermore, I don't think anyone in their right mind doesn't realise what they are getting into, when they join the IDF, regardless of whether they carry a gun or not. Everyone who joins voluntarily is "joining for their own needs", whether that need is 98% altruistic or 2% altruistic. I understand your premise, bit I think it's a bit naive.
That being said, my qualifications for judging my medical condition is mainly the fact that it is Iwho has had this condition!! I know how it affects me, how it doesn't affect me, and what level of performance it allows me, better than any doctor does. Furthermore, I've been an EMT/Medic for the better part of a decade, so I have a bit of medical background.
Furthermore, I have experience with authorities in the States that overeact to medications. See for example the Federal Aviation Administration. They have paranoid, extremely restrictive medical requirements for pilots, to the point that many, many pilots lie to the FAA doctors, and there are no shortage of organizations dedicated to defending pilots who have been medically disqualified.
In consideration of that, and in light of the massive beurocratic mess, disorganization and utter chaos that is the IDF, as I have seen with my own eyes, I would not venture to guess that they would be very "accomodating" or "understanding" to anyone, nor would I imagine that one has the slightest chance of asking them to "work with you".
As for an introduction, I will post one asap.