Can you describe in a bit more detail? What happens and exactly when, such as what happens if you brake lightly, or is it once you've stopped, is it more or less depending on how hard you stop, does it happen if you brake while turning, etc.
Apply brakes, car stops, then moves forward a bit. Could be a very soft stop. Happens intermittently, but not when brakes are applied during turning.
Hmm.. well with a manual, if you have the clutch pedal fully depressed & it's doing its job and has the drivetrain completely disengaged from the engine, if you're stopped on level ground, taking your foot off the brake, you shouldn't move. Clutch system is pretty straightforward - check the clutch master & slave and lines for any leaking. Not sure that they had them, but if you find your E36 has a clutch delay valve, I'd remove it (but that wouldn't cause the issue you describe). My guess is you have a failing slave, &/or clutch master. Given the age and mileage, if you have to replace either or both, I'd replace all flexible lines while at it. Other thought, maybe an issue with the throwout bearing.
So are you at a complete stop with your foot on the brake and the wheels move forward? Or do the wheels not move but the vehicles chassis feels like it is still moving? If that makes sense.