You aren’t the first to think of this. Unfortunately, the issue is three-fold:
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Top row modules are often blocking the pogo pins, either by using them themselves (keyboard, led matrix, spacers-to hold them down), or extra magnets to secure the module in place securely (num and macro pads). The link below actually proposes a solution to this problem using flex PCBs
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Actual available space on the bottom row. If you look at the midplane plate, there are glides and latching mechanisms consuming most of the space at the ends of the bottom row. There isn’t much you could fit down there. Even the trackpad keeps all of its hardware as centered as possible so you can position it to the left with the keyboard+num/macro combo on the top row.
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Beyond the touchpad, the bottom row is a wrist rest. There isn’t much you could put on the bottom row that wouldn’t then be constantly messed with by your palms and wrists as you type, spare maybe a screen, but you run into issue #2 again
So, I wouldn’t expect Framework to even spend any resources looking into this, but it’s certainly possible someone in the community could come up with a creative solution to add something…capacitive sliders or something, to the ends of the bottom row.
There even a discussion here of something someone has thought up:
So, perhaps think up some other possible uses for the extra space, but it will take the community to bring it to life.