Open Kwrite / Kate in superuser from Krusader on Gnome

I stalled KDE Full, but don’t know how to RDP from Windows as my preferred session, so in using Krusader as Root to make changers to root text files I want to use Kate / Kwrite to open multiple files and I don’t like gnome’s default limited featured editor.

In saying that, what plugin / lib do I need to install to get superuser privileges on Kate / Kwrite on gnome?
How I do I make KDE my preferred window session using XRDP?