Has there ever been consideration to adding Walks as one base?
No.
I can't speak for Redz, but a walk takes no talent and is not really "earned", so it makes little sense to me.
This, (and the other Pick-A-Player games), have generally been more about the talent and achievements of the player than just about adding empty stats.
Again, just my opinion ... Redz started all this, it's his creation, so it's really his call, but that's pretty much what I've assumed from the parameters to this point.
Good for discussion, though, if anyone wants to continue or would also like to consider it seriously.
I guess I gave my vote at the top of this post.