Everything is now working.
Got hold-down press right click to work. I also managed to install Florence and get an on-screen keyboard for login and lock screen. You have to disable focus grab and dimming to use the on-screen keyboard in gksudo.
All that is needed now is to add Florence and the 3dsp radar thingy to startup applications, and disable requiring the root password for the wifi radar.
I feel it would be good to create a guide on how to get the tablet fully set up. Do you mind if I use the instructions on your French website, but translated to English? (I will, of course, link to the source).