I drive quite frequently an old car without hydraulic servo on the clutch, there's no feedback from the pedal regarding the bite point. It has that so called 'clutchy feeling' which e.g. the G25 clutch does not have, but the feedback comes through the driver's... back end
Thus I don't really think a FFB clutch pedal would make any difference, a motion simulator might, though.
The clutch in LFS is far from perfect, it might not be one of the biggest troubles in the game but it should be improved sooner or later IMO.
That certainly shouldn't induce the OP not to try LFS, it's still supposed to have one of the better clutch simulations out there.