When setting wages, I found an issue.
To reproduce, start a game with your HQ in a low cost region, such as India, then open a branch in a developed region, e.g. New York. When setting the wages for the branches, if you select the New York branch, then move to the engineering tab, the wage requirements for the engineering team are those of an American company, rather than an Indian company.

As for the engine builder, it would be nice if there was a way to lock the bore and stroke when changing the engine type, e.g. when changing from a flat 6 to an inline 6, the bore and stoke sizes change, as the slider positions stay fixed, rather than the values.