Wow you have been busy! Very nice Joerg! I like all the screen shots- will make it so much easier!
A couple thoughts for the wiki:
-after running raspi-config if I make changes it prompts me to reboot so I don't have to go to terminal
-I know I am a minority Linux user but for me to create my Jessie image on an sd card I use the "Disks" utility (so all gui). I "format" (quick or slow), "restore disk image"(write Jessie), and can also make a backup with "create disk image"
-maybe I missed it but you can copy the executable from qgroundcontrol_aq/bin to the desktop
-the alternative for udev rules is terminal "sudo su" then "cd /qgroundcontrol_aq/bin" and "./qgroundcontrol_aq" to run as super user AFAIK
A couple ideas on development:
-setup a service or bash script to start qgc. Possibly even avoiding the overhead of the desktop gui by raspi-config boot to cammnd line
-bash script to start the bluetooth by itself or included with the above script