Thanks for the great plugin! I frequently use this in conjunction with Menu Humility. Ironically, Menu Humility overrides the WP Help menu position setting (other than the Dashboard Submenu option).
It seems like Menu Humility is explicitly made for plugins that force an item into a new position with no admin options. Since WP Help graciously gives admins control over this, it seems like Menu Humility should not force it to the bottom.