More height (normal map) controls - low/mid/high frequency, bevel shape (curve), NDO-style
Currently (v1.5) we can only set height's intensity. It would make height much more useful if we had fine control over how the height map is interpreted.
NDO is so powerful - has many presets for bricks, bolts, concrete etc. - just because it has the ability to control resulting bevel's shape. So it's easy to create a preset which adapts to a specific need.
B2M has simple separate low/mid/high frequency settings, which is sufficient for many situations.
I would like to see a bevel filter for masking. Adding text to a height mask in Painter results in sharp edges. Through blur and levels, I can get something like a "slope" along the edges in the material, but nothing as clean as a true bevel filter similar to Photoshops Layer Styles.
Also, everything this OP said is what I'd like to see. NDO is still very useful for painting normals, especially bay hand with a brush, and its map converters are still unchallenged in accuracy in 2020.
Would love this, I currently use OS X and have to reboot into Windows if I need NDO - much better to just have something like it in Substance and stay in one OS/Software.