I would love the formula editor to be multi line to make it easier to read, edit and understand the formula:
if(((field("Box")!="")&&(field("Room")!=""))||((field("Box")="")&&(field("Room")="")),"? Item must have either Box OR Room (not both, not neither) and we set the room for box over there","")
vs
if(
((field("Box")!="") && (field("Room")!="")) ||
((field("Box")="") && (field("Room")="")),
"? Item must have either Box OR Room (not both, not neither) and we set the room for box over there",
""
)