You will not be able to use the mode switching w/o the Saitek / Logitech Software, which is utter crap on top.
In case you really need those several modes, you will have to look up on the Logitech website / forum / on youtube how to do it.
Concerning DCS profiles: you'll achieve more, in the end, if you just look at the real life controls of the plane you want to map and replicate that on your setup. You will know what is where by heart, then, and it is pretty quick and easy to begin with.