Zoroastrianism places special emphasis on honesty, and in fact the forces of evil are known as the Lie.
Same in Christianity, really, God is referred to as the Truth, Satan as the Father of Lies, e.g. John 8:44:
You are of your father the devil, and the desires of your father you will do. He was a murderer from the beginning, and he stood not in the truth; because truth is not in him. When he speaketh a lie, he speaketh of his own: for he is a liar, and the father thereof.
Especially in the early centuries it was believed that even death was preferable to e.g. lying about your identity to people searching for you.
How is the feudal system going to be fixed for India? The Muslim world right now is barely playable because of the shoddy job they did trying to port the feudal system in a region where it barely existed and certainly.
Probably standard muslim stuff for muslim states, some of the existing succession laws or something new for the Hindus, by way of approximation to primo, gavelkind or feudal elective etc. Titles would probably be localisations like raja = duke (even though it means more like king and some rajas had more stuff than some maharajas), maharaja = king, emperor is just emperor, barons and counts something exotic. Muslim titles would be even more exotic with nizams and nawabs. Council and minor titles would perhaps also be localised, mostly drawing from existing Muslim stuff, I guess. Plus portraits, shield models, unit models, new cultural retinues/buildings, some music and a new interface.
One good thing about the core mechanic of this game is that it's very easy 'localisable', where the same refers to graphics etc. Basically a modular skeleton on which you can easily adapt the meat.
Incidentally, this is also actually more or less how real-life feudalism worked. The notion of feudalism is actually way exaggerated, it's simply an artificial post-hoc classification that some people take too seriously.
Also, you don't need to look farther east than Poland to find a culture where feudalism actually doesn't make sense (notably the hereditary 'Dukes of Greater Poland' in 1066 are fantasy). Anything at a province level or above was held by an appointment for life or for good behaviour or for the king's pleasure or for as long as able to serve. There were no proper counts, and no dukes whatsoever outside of: 1. the royal family, 2. the Pomeranian vassals (virtually cadets of the royal family anyway). Russia? The words 'count' and 'Rurikid' don't belong in the same sentence. A baron? Might as well call him wali or sahib.