Coming back to this having not played with firmware and forgotten what little I learned about firmware etc. after first getting my M01.
I’m using Chrysalis now for colormap and key assignments. Remind me: how do I tweak something like the MouseKeys properties you mention above without losing all my Chrysalis mappings? I have a feeling once I go into Arduino and flash a custom firmware it will bugger the Chrysalis stuff up.
Needless to say it would be nice to be able to adjust this with Chrysalis but I still think the out-of-the-box settings on Ergodox are way better, full stop. Maybe it’s not that simple - does QMK just have a better underlying algorithm?