When I think "dinker" I think of two things.
1.) Interesting color/pattern beyond just "normal" looking. These animals are tried to prove out a new gene.
2.) Taking animals with reduced or busy patterns, flames, blushing and try to influence existing morphs. You could also call this selective breeding. I think that many of these "dinkers" could be used to enhance specific morphs. Ex. Taking a fairly reduced pastel to a reduced normal trying to influence and make a nice reduced pastel. Or a nice fire like normal to pastel to try and brighten up the yellowing. The list can go on and on.
Just my .02 on dinkers.