Reverse manual valve body questions

I think some guys like to go to neutral for the purpose of reading the plugs. They can go from WOT to zero rpm, coast down, pull off the return road and pull the plugs. Never done it myself. There is this here pricey vb: COA-22015-AL - BILLET ALUMINUM MANUAL VALVE BODY KIT W/CLEAN NEUTRAL (REVERSED PATTERN) PRN123N