I would just be happy if all the options we know are available were made available in the custom shop. For example why are some handle options, as simple as Dymondwood color, available for some models and not others? Why isn't micarta available? Why are clip point and drop point blades in 420, 5160, CPM154, and s30v with or without mirror polish not available for the 110 and 112? It would also be fun if all the blades that would fit in the 110/112 were available such as the bucklite, bucklite max, and slim model blades. And don't forget pocket clips, long pull blades, aluminum frames, flat ground blades, and optional nail nics. These are all simple additions that we all know they could do and that require no additional tooling for them. Another fun addition would be to open up the whole 100 series, including the less common 116, 117, 124, 121, and 192. Then collectors could put together whole sets of custom blades. A two blade 110, 112, or 110/112 would be cool too.
Again none of this is earth shattering change, it's just giving us the same options that larger buyers get when ordering runs of knives.