With FI, you may run out of MAF calibration, so it might be better to keep the VVE accurate.

When using the MAF, the only thing the VVE is used for, is to provide a "sanity check" and correction for the MAF signal. This only occurs when the engine RPM is below the "Fast Speed" threshold, above that value the ECM only uses the MAF anyway.

Basically though, if you plan to use the VVE, then dial it in.

As for the old MAF vs MAFless debate, the E38 has changed the battle field a bit.....