mikew777, better find out from someone who knows for sure but seems to me using a PCV with ECU Editor would be the same as using a PCV with a flash. If the fueling has already been adjusted in ECU Editor, it probably is about as lean as you can safely go. The typical PC5 map will be aiming to do the same thing so what you end up with after the PC5 adjusts the fueling signal after it comes from the ECU is probably going to be twice as lean as you should go. Could be real trouble especially at high rpm.
If the stock fueling was not changed in ECU Editor, you might be able to use your PC5 safely. If you had Autotune or Wideband2, that would tell you if you were running lean. You would be able to see if it was working properly by looking at the AFR. The AFR should stay close to your target AFR at all times if the fueling is really good.
...or it could be a less obvious conflict. I have no knowledge of Smith's ECU Editor module yet. Call him and ask. I'd like to be able to use my tuning equipment with that black box if it is safe to do. I mean, I already own it so be nice to play with it.