No, because dropping the first packet in a TCP connection means that the handshake doesn't complete. Tarpitting allows the handshake to complete and then keeps the connection open, which will keep the client connected for a much longer time than if a host doesn't respond to a SYN packet at all. http://en.wikipedia.org/wiki/Tarpit_(networking)

That's not tarpitting. Tarpitting involves keeping the connection open in order to tie up the resources of the attacking host.

Or just add some salt?

Hasn't that already been done?

...that is all.