Well, Dwarves *did* have a strong 'dwarvish' accent when speaking Westron or Sindarin. This is written in HoME XII. Now if we had someone who speaks Hebrew, I guess this accent would fit a Dwarvish one (isn't Khuzdul based on Hebrew? Thought I read something like this in these forums).
Hey Athan, isn't that you speakin a semitic language?