Pianoteq EQ effect, how does it work? Use it for speaker crossover eq?

The main equalizer is a bit different from parametric eq in a DAW. You draw a graph with linear segments, there is no Q setting at each control point. Pianoteq using the EQ configuration in its physical model, rather than applying an EQ to a calculated audio signal. I note that there is also the EQ3 in effects, which is a parametric eq.

How does the resonant EQ work? Does each piano have its own (hidden?) cabinet resonance settings that we can then adjust using the resonant EQ and timing?

EQ3... as it is a more traditional eq, is it changing the phase of the signal also? Ie introducing phase distortion at different frequencies. Or is it the eq type that maintains phase across the frequency range?

I'm examining building a diy 'console digital piano' setup with several speakers, dsp eq. I'm wondering, if I make it Pianoteq centric maybe I can forego any separate dsp eq stages and do everything inside Pianoteq? (This is for live practice, I understand that if recording I'd need to turn off all speaker specific config.)  Eg if I want to correct boominess of a cabinet speaker or even the room, I could do that with Main EQ in Pianoteq? Where is that best applied, in main eq? resonance eq? EQ3 effect?

If I forego other effects, I can use 3 different copies of EQ3 yes? In order to get more parametric eq band adjustments. Any disadvantage to that?

A speaker setup is going to need crossover eq to control which frequencies go to which speaker drivers. Normally this would be a separate component as passive crossover in the speaker or for active speakers its a dsp component that would sit between PTQ and the amplifiers. However, could even this be performed in pianoteq? The output microphones section can feed different signals to different output channels, which can go to different speaker drivers in the cabinet. But the output microphones do not have individually configurable eq so can't act a crossover filters. At least not in my Standard edition. But there is the layering feature. I think I could layer 2 identical pianos, each layer with its effects->eq->main setup for each speaker driver? Or maybe better with EQ3. 

Parametric eq for each microphone or output channel in the output section... sensible feature request?

Comments? Many thanks.