Yes lukas you are correct,
There is no way to remove the help button choice from OIF via the OIF configuration.
For the Componet type FPM_OIF_COMPONENT there is no Option or missing
in system configuration tool to customize help and Personlization
function, to accomodate chages one can enhance the Assistance class
namaed CL_FPM_OIF_ASSIST , RENDER_HEADER method to remove the button
from the toolbar.