Not sure if those tile thingies make sense?
solitud.de | YouTube | Soundcloud | Bandcamp
1U Tile switch module with high quality momentary C&K switch.
http://pulplogic.com/product/switch/
It's a little awkward as they are 1U in height (not supported by modulargrid), but they exist...
Here's some cases that support the tiles:
http://erthenvar.com/store/lunchbox
http://www.ebay.com/itm/251306429860
You can also build your own:
http://erthenvar.com/store/eurodiy/casehardware
Here's a thread on Muffwiggler: http://www.muffwiggler.com/forum/viewtopic.php?t=65340
Like you said, the problem is that ModularGrid does not support this format.So this is a compromise in the graphic representation of this modules.
Problem is that nobody would layout their realworld racks with this compromise (wasted space).
So I am not sure if it is really useful to plan a system.But for sure people maybe interested that this subformat exists, so for now the tile modules should stay until we find a better (technical) solution.
solitud.de | YouTube | Soundcloud | Bandcamp
Yeah, it only works if you dedicate an entire row of your rack to 1U and ignore the extra space...