I guess they could adjust the generator somehow, but the response would have to be really immediate. I think I could adjust to something that feels like rubber

I guess they could adjust the generator somehow, but the response would have to be really immediate. I think I could adjust to something that feels like rubber band instead of chain, but varying speed over pedal stroke sounds bad. Yes, I know that some people swear by elliptic chainrings. I had Biopace rings back in the day and didn't really like them even though the effect was quite small.