Ahem, perhaps I've missed something, but my 122 key '86 terminal board is coming along nicely in that regard...only a couple hurdles left.
Every key on the board sends a scancode, making every key on the board reassignable. That said, there are still those couple significant issues remaining.
http://geekhack.org/showthread.php?t=6770
From that thread, one of the questions that have bothered me has been answered:
http://www.seasip.info/VintagePC/ibm_1390876.htmlnot only shows the Scan Code Set 3 scan codes for a 122-key keyboard, which match what I already knew, but also show what they are translated to, giving me standard values for the other two scan codes (because the translate table for those from the BIOS is available).
EDIT: And I see from there that my Memorex 122-key keyboard is fully equivalent to a modern IBM Host Connected keyboard using Scan Code Set 3, producing the same results, at least in terms of the Scan Code Set 1 equivalents returned from the BIOS.
EDIT: I can understand why, despite the frustration of many, Unicomp is not making a great many new products. The standard 104-key keyboard would probably be their most popular product, and coming out with an attempt to imitate, say, the Happy Hacking keyboard might produce an inferior result as well as limited sales.
That being said, though, what extensions to their product line would be reasonable to hope for? I think that more compact keyboards are popular enough that some alternate choices would be worthwhile to provide.
The one they're about to come out with, a 104-key keyboard with the numeric keypad omitted to shrink it, is the first obvious choice.
The second would be a keyboard that is even more compact, because it has the arrangement of keys of the model M4. That keyboard design depends on some keys being only slightly over 1/2" wide instead of 3/4" wide, though, so it would require designing molds for a new keycap. However, that layout could be modified a bit, or a different laptop-like arrangement could fill this niche.
The third compact keyboard alternative that would seem to be worth making would be one of those designs where the numeric keypad is placed above the right-hand side of the alphanumeric keypad, and the function keys and everything else are shoved in the space to the left of the numeric keypad, if this isn't prevented by patents.