How does that work then - do left shift & enter key caps bridge over the cover on the respective layouts where they're bigger?
i.e. on the US/ANSI layout photographed on the site - L Shift is using both L Shift and Backslash holes; Enter is also occupying Octothorpe, but not covering the hole above it where Backslash is in that layout? So you have a fixed, what I think the mechanical keyboard enthusiasts call 'switch plate', and then different sized key caps for the relevant keys making them occupy multiple spaces with dummy switches or whatever?
A touchpad with buttons is something we believe could fit in the existing cover though, and something we want to explore more when we have time.