1) If you mean TUNERS's settings, you can copy all the lines from /etc/enigma2/settings which start by
config.NIMS
2) Difficult and not advisable.
Much better to reinstall every lugins.
You can try anyway saving the so called Peronal Backup by the backup section of the GUI. But don't rely on it too much...
3) ??? Do you mean satellites.xml? Not necessary but if you customised it, you should already know where it is located (/etc/tuxbox).
If you have never customised it, you don't need to do anything because it's part of every image. Please explain.
If mean 4) see below.
4) Always possible, in many ways: computer software like iDreamX, Dreamboxedit, DCC, or simply by the OWIF and a browser
5) Some are in the same
settings file I already mentioned in point 1. But the initial wizard will do the job in a tenth of the time you want to spend to go hunting them as configuration files...