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Is there any way to add more displacement nodes?

No, each material can have only one.

...it'd be so useful in Rhino, there's a lot of cases where is imposible to get the needed displacement adjustment with just one displacement node.
In Rhino almost all the complex materials have to be done using more than one mapping channel, so I think there should be more than one displacement node to make those materials easier and without exporting geometry to do it in another application isn't it?

Is this an extrange petition or would it be possible if a ask for it at the wish list section? (...I guess is not a question of the Rhino plugin but the main core)

Yes, it would have to be added to the core. Per-surface (i.e. in polysurfaces) material assignment/mapping would also be helpful, on the Rhino side.

Thanks JD! ...added to whish list