Ctrl+drag on SPLOM causes an error


I am trying to create a SPLOM Spotfire Mod using Plotly.js and trying to make the Plotly selection look and feel like Spotfire marking. So far so good, except when I press ctrl+drag I get this error:


Here is the codepen I got

And here is the error when ctrl+drag. I would like to use ctrl+drag vs alt+drag and use alt+drag for other purpose. Is there a way? At least for the ctrl+drag piece.