On Mon, Feb 1, 2016 at 12:18 PM, <tom@trellis.ch> wrote:

to put in other words i wondered if a client can ask to "autostart" a
temporary dummy server with only a few arguments easily code-wise
(assuming *any* jack has a dummy backend built-in) instead of relying on
the ~/.jackrc file.
the other non-dummy cases are more dialogue-demanding, no question.

The dummy driver still has a good size selection of parameters. And such a startup also offers all possible server parameters too. Starting the dummy is not really notably easier than starting any other backend.