The fuse sends power to the euroswitch. When I pull it on my car the front fog icon doesn't light. So, the fuse is just for the fog light, there are seperate fuses that run the brake lights, and also run the rear fogs when they are operating as break lights.
Yep, the jumpers are just if you want the 5 light mod too. If you don't want to do that part, you don't have to install them. If the rear fog light was the only thing you were connecting, you also wouldn't have to use any diodes. BUT, FWFI, I think the 5 light mod is a good safety improvement. So even if you didn't want to install it now, I would wire in the doide for the fog light wire, in case you wanted to do the 5 light mod later.
-Jason