Is it possible to set up differential timing on the Timy without the aid of computer and software?

Not as of yet. It is on the ALGE Timy wish list.

In concert with Split Second Club software and the differential timing feature, the Timy performs nicely. If the Timy can someday do this alone, you have even more on hill versatility. With the laptop, I was lucky to have a sunny day as I was without a shack. And we all know successful timing involves leaving "luck" out of the equation.