The heads of the screws will take up a lot of space in the corner of the tongue and groove and will remove or displace a substantial amount of wood when installing them. If you feel compelled to use them I would recommend trying it out on someplace where you can take it all out if it does not work out.

The nails and boards are all designed to work as an engineered system. Deviating from the system is asking for trouble IMHO.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.