Semiconductors

I am used to modeling a switch with a low turn-on voltage using an NPN and a PNP transistor component. Why aren't they in the PLECS library?

I'm concerned that ideal switches cannot be used to simulate resonant topologies, is this true?

I would like to use a component (electrical) model that has been provided by a semiconductor manufacturer. Can I import this into PLECS?

I would like to use a SPICE model of a power semiconductor. Can I import this into PLECS?