Huh? The pinkie switch is the latch your pinky on the twisty controls in order to switch modes from mode 1 to mode 1 + pinkie. In other words with SST it allows you to map two commands for a single button. One command is with the button itself and the 2nd command is the button + pinkie switch.
First off is the pinkie switch showing in your Sairek controller? It should be button #6. I dont see how the clutch mode should have any bearing but go ahead and uncheck it if its checked.
Now go to your SST software. First I have to know if you use SST or if you simply have pinkie mapped straight to the game and pinkie wont work that way. If thats the case it might be a bad map, most of all if its a macro so map the function to another key and then check it.
If the problem lies with SST make sure you havnt changed any settings in SST. You should have mode 1,2,3. The first 3 modes should have Mode 1 + pinkie in the middle. Mode 2 and 3 the same 2+pinkie, 3+pinkie. To the right are the 3 mode/pinkie controls. Before i get into that makes sure you explain your mapping correctly first.