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I'm in with the simple minded crowd: do not put a number code on the cover - for the large majority of potential readers, it will be confusing rather than enlightening.

Anything requiring a cipher to understand does not add to buyers appeal.

I have no really new ideas, but would recommend a combo of several of the previous mentioned:

1. For timeline use a 4-digit year only and print it across top of the spine. Placed on the very top of the spine, it'll let you keep the present layout (a logo, the title, author name and publisher) - and it will be easily readable and understandable.
2. Do not change the short to-the-point title setup you already have. The one/two-word titles rock! I know this disqualifies my ramblings re. the precise formulation for the assignment; but I really think messing up the actual title with a numbers code would be a mistake.
3. In each book, on the 'Also by Scott Sigler'-page, include a complete listing (as now), but list the titles as yyyy-TITLE
4. Maintain an evergreen WIKI-page w. an eeeeasy address for total overview for those with early edition books.

In toto: keep it simple

Finally: I'm taken w. Mr. Fahrenheit's timeline - it's a super cool illustration that'll work wonders as a 'Also by Scott Sigler' page #2.