Likely that Scaler doesn’t address every musical case for polyrhythms. As a fellow polyrhythm afficionado, I was quite pleased with what came out of the box already. For the more nuanced requirements I have my complementary tool set (Reaktor, Falcon, and various iOS based MIDI Sequencers with flexible timing).
From a percussion standpoint, I’ve had some interesting proofs of concept…
Try out Scaler for percussion! - General Discussion - Scaler Plugin - Community Forum