To answer the question Yes there is a 3-p90 standard but the wiring is three way switch vol for neck and bridge, master tone and vol for middle pickup only. Hamer was willing to put a push pull pot in the guitar but said it wouldn't be up to their standards. The current wiring was what they suggested. It works well and gets some amazing tones.Wasn't there a 3-P90 Standard that used the switching you're describing (ie. regular 3 way with push pull for middle pickup)? Anyway, I prefer a 5 way blade with a push-pull (or, better yet, miniswitch) as a bridge-always-on switch myself. That way I don't have to readjust my thinking too much to get all the combinations.