A lot of great suggestions here! I think what Menards is doing so far has been great. It just keeps getting better and better. I don't have any of their hopper or tank cars, yet...that will most likely change once Christmas gets closer. The possibilities for new paint schemes on the hoppers, tank cars, boxcars, and flatcars is almost limitless. Hope they keep 'em coming!
I'd like Menards to put out some more cabooses, too. Again, there's no end to what paint schemes they could put on them.
As for things they haven't made, I think it would be cool if they would find a way to produce a series of passenger cars, maybe 027 size or slightly larger, at a reasonable cost - maybe the $35-$40 range. Have them be based on Budd streamlined equipment - a baggage car, coach, dome, sleeper, observation car, etc. Not that I need any more passenger equipment (LOL), but I wouldn't mind adding the occasional coach or something in old railroad liveries as "private varnish" on my Amtrak trains. Or offer Amtrak stuff? I hear it's kind of difficult to get Amtrak licensing but if Menards could do it that would be awesome.
If Menards did offer locomotives, they'd have to be basic, conventional ones. Nothing wrong with that, those of us that like command can add it later if we want to. A $70 or $80 diesel with decent detail and reliability and a working horn might be a home run for them.