Cinto: I've had broken lug bolts and lug nuts screwed on so tight I could not remove them (and I was a body builder). Back when I was an apartment dweller in Washington, DC, my Civic and I were at the mercy of the local Honda dealer.
The last time I went for an oil change, I knew they would screw up the tire air pressure and over-tighten the lug nuts. I called out the service manager right then and there and handed him my torque wrench. The lugs varied, but none were under 130 foot pounds.
There are threads here about how rotors get warped. Improper torque tightening and pattern on the lugs can contribute to warped rotors. I am wondering if the screws can cut down on this- and Honda figures many "mechanics" will NOT use a torque wrench and proper lug tightening patterns so screws help minimize this chance of warping.
If we do the work ourselves, I would assume we mount the wheels properly. So screws or no screws it does not matter. Maybe I should have asked only those that do not work on their cars if leaving rotor screws out leads to warping....but then those folks probably would not know what a rotor screw was.