In general with help of SmartPLS it is possible to use “single” dummy variable as independent variables. But as far as I know you cannot use more than one dummy variable per construct with the actual implemented algorithms. Furthermore you cannot use a dummy variable as dependent variable. In the last case you have to use a logit regression.
Greetings,
Christian
What do you mean with a "first-order formativ construct"? If you mean single item measurements as independent variables than I would say "yes".
Greetings,
Christian