In the last cube I ran, I threw a couple IDs into the cube itself. If you drafted an ID, you could choose to use it or not, but every ID came with the caveat that your minimum decksize became 10 less than that of the ID you drafted. So Cybernetics Division would keep the draft 30 card minimum, but Making News would bump it up to 35. The IDs I threw in were Harmony Medtech, Cybernetics Division, BaBW, and Making News for Corp, Nasir, Maxx, Exile and Silhouette for Runner.
It turned out pretty reasonable. The extra 5 cards was a significant enough disadvantage to discourage automatically running them, while Medtech and Cybernetics had abilities that were mutually risky for Corp and Runner. The only ID that was a strict upgrade over the default IDs was Silhouette, and I don't think I'd include her again.