I've only actually use a SL66 (non-e, non-se). But the instructions indicate that the meter does not turn on until the meter prong in the camera body is moved from it's rest position. Hence a non-e lens would not turn on the meter until it has been modified to contact the meter prong.
The SL66 uses 3 sensors behind the mirror, 2 for metering, and one to compensate for light entering from the viewing screen. When a lens is stopped down, the light entering from the viewing screen may overwhelm the compensation circuit, resulting in inaccurate readings, hence Rollei may have designed the system not to work in stop-down mode.