Glen,
In fact, yes our factory can produce them. However, as you said, it increases cost. It also reduces portability as it requires a much larger case. The other issue is that the fittings used must be proprietary if the torches do not share the same Dinse style fitting. This leads to more complaints. Also, it leads to more circuitry, and reduced reliability. We have chosen this style for a purpose. IF a customer needs a multiprocess, then there are compromises at this point that will be made. Unless a customer really needs the convenience of a multi process,separate unit, going with separate units is always the best and preferred route.