Good ideas Frank. Though in all likelihood if Menards did produce any of your ideas, they'd probably be more along the footprint size of their last American Power and Light building. Still pretty big, but not so large as to limit the sales potential.
But who knows. Doing the buildings doesn't require tooling the way a piece of rolling stock does. So I guess it would depend on the profit margin point of the quantity made versus the actual interest in making larger structures that undoubtedly are attractive to some modelers, but probably have more limited overall sales.
You know Frank, you're so good with the graphics... you could maybe strike a deal with Menards. They'd have more sales potential by offering like - your idea of the Railroad Warehouse building - but without road specific signs. But you could design signs that the customer could apply to the side of the building.
I mean, let's be real.... if they did that RR Warehouse building in let's say C&NW... that would please the C&NW fans. The others would be waiting for another run of buildings. Inevitably, someone would get left out of the equation... just the nature of the business.
Even if Menards just made the buildings and you posted your building signs here for folks to print out. Obviously, that might turn off some folks, having to do that themselves. But on the other hand, it would probably be more financially justifiable for Menards or anyone to make a building with the greatest sales potential.
Obviously, Menards could offer a building with printed signs in a variety of several roads that the customer could attach. How much cost that would add, versus doing the buildings in specific roads... well, all I can say is the old adage it's hard to please everyone all the time.