How about, probably not feasible, for manufacturers to design an additional lid, which would replace, or sit on top, that would be able to support a 2nd board, or computer, etc. I guess Korg and Kawai and other co's. I just like the idea that I could play two keyboards without carrying heavy scaffolding.
I know ppl will say Rhodes and similar, but I'm thinking light dp's like Nord and Yamaha offered extra mods.