Maybe I am too Old School, but I have to say that this demanding/somewhat negative attitude that comes with "I want this, I want that, for x&a $ the Kemper has to have, ... becomes increasingly harder to tolerate.
The general term that comes to my mind is "spoiled little brat".
Given that it is a feature request section why not let him ask for anything he wants to? When expressing what one would like to see added it has to come down to saying "I want this, I want that" at some point. Also don't forget that in a forum it is often hard to discern the tone that is being used, especially given that it is an international group of people who post here and English is often not their first language. Personally I think that calling him a "spoilt little brat" is uncalled for but maybe I missed the tone you intended it in or English is not your first language ...