What I'm interested in is Islamic Philosophers/Theologians who are important writers on the idea of Haram/Halal/Mokru and the Islamic idea of Virtue.
As an example of what I'm after, as I'm more familiar with the European Tradition, Kant, an 18th century german philosopher working out of a christian pietist tradition remarks about virtues:
But that man can be called fantastically virtuous who allows nothing to be morally indifferent (adiaphora) and strews all his steps with duties, as with man-traps; it is not indifferent to him whether I eat meat or fish, drink beer or wine, supposing that both agree with me. Fantastic virtue is a concern with petty details which, were it admitted into the doctrine of virtue, would turn the government of virtue into tyranny. (Metaphysics of Morals, The Doctrine of Virtue, XVI)
It seems to me that adiaphora (which appears to be a term imported from stoic philosophy) is roughly synonymous with the islamic concept mokru. That categorizing virtue can descend into a morass of pedantry seems a distinct possibility - for example that alcohol is banned because it intoxicates that is because it makes a man/woman irresponsible and without restraint; but then some will think that perfume should then be banned as it uses alcohol - they don't notice that one does not drink perfume. They're reacting to the word alcohol as symbol.