Amazing!  A message unrelated to developing film with pyro!
The consistency issue is not an easy one to approach, as I think that much of it
has to do with the age of the solution.  At least, that has been my
observation.  I also believe that the concentration of sodium thiosulfate can
alter the tone, though I really haven't played with that.
Forget selenium toning.  All you'll do is bleach the print.  I don't know of any
options for toning.
george
-- Handmade Photographic Images http://www2.ari.net/glsmyth/