you wouldn't use the meat knife on crusty bread but, equally, the serrated knife and straight edge knife aren't going to go through raw meat as quickly
i usually use pickup ring screws
hmm, cant remember if the covers i had were countersunk. i dont think they are usually. I cant remember having to do anything last time i used them but i wouldnt be shy about countersinking them gently by hand if needed
no idea whats usual for the dogear covers.