I think this is a feasible idea that could actually enhance gameplay. It could use some tweaking, but I think the OP was just throwing out a general idea. Some of the features like murder detection are almost certainly in the game already. Some ideas like diet restriction depend on whether a hardcoe mode is being implemented, obviously.
Restrictions could be viewed as an advanced form of faith, thus generating more power for the daedra, and potentially being repaid by special blessings. As others have said, any divine gifts should be light, but I think the general idea is great.
Maces aren't blunt. http://images.uesp.net//2/28/OB-items-Maces.jpg
Fair "point", but if there were an order that had that restriction, they could certainly design maces and flails that avoided sharp edges. Or just use H2H or staffs. It's a bit hypocritical and is a deliberate abuse of a loophole, but i think there are plenty of real-world cases of this kind of behavior in any form of dogma, religious or otherwise.