I've suggested that. My idea was that you could put the sidenotes on one side, and the margin notes on the other. A downside of this, however, is that sidenote

I've suggested that. My idea was that you could put the sidenotes on one side, and the margin notes on the other. A downside of this, however, is that sidenotes are only useful if they are close to their referent and you can easily 'look to the side' to read them and then back. If you can't, they're just footnotes. And if you take away half the space for sidenotes, on particularly sidenote-heavy pages like _Radiance_ https://www.gwern.net/docs/radiance/2002-scholz-radiance https://www.gwern.net/docs/radiance/2002-scholz-radiance they would wind up being stacked in the only margin for long enough that they would be off-screen, even. Maybe that's acceptable, but it's enough of a drawback that we haven't pursued it.