Some more possiblities...
The EIU's send the FMC
1) flap position data ,and
2) thrust lever resolver angle (thrust lever RVDT angle). This signal is used in the logic for engine trimming, but I guess it could have other functions, too.
I'm not sure what flap position data is given to the FMC, but during reverse ops, Group B (I think) LE flaps are retracted.
Cheers.
NSEU