Hello Konrad,
My personal view:
In my eyes the whole system looks really promising. I will work on the Kontact Touch configuration when I find more time again. It looks great and I like the approach. (Maybe the Nexus 7 does not have enough power but I would like such a small device with a full linux system and kde plasma active desktop.)
I hope you found my feedback a little useful. Sorry if there was nothing useful for you but I think that is the least that I could do.