Ok i made a KUAL extension for those (like me) wants to choose whether to connect and to what network to connect if there are more than 1 known networks (each with its configuration)
If you want to use it (for now) you have to do some editing:
1) unzip archive
2) edit menu.json file to change the name/number of known networks (change "
Network1","
Network2",... as you want)
3) edit bin/conn_ctrl.sh to change your networks KEYS/SSIDs (and if you want to assign a static ip/gateway decomment (and edit for your needs) the 6 lines between
iw wlan0 link and
echo "done")
4) copy connection_control folder in your kual extensions folder
5) remove all the networks you want to prevent auto-connect from the kindle settings UI
NB: keys are stored in the script as clear-text. Later (if i'll find time/fancy

) i'll do some form of encryption