I’ve seen posts with ideas for displaying the numeric parameter value when changing a parameter. It would be nice if the display of the parameter change was tailored to the specific parameter being changed. For envelope parameters this could be a graphical representation of the DAHDSR curve for instance. These graphic representations wouldn’t need to be exact to the Hz or ms (or whatever unit is relevant for the parameter being changed), but the visualisations could be helpful in helping the user understand what’s being changed.
Displaying parameter changes on the screen would be especially useful when working with relative pot mode (and to a lesser extent pass through mode), because then the parameter value doesn’t necessarily match the pot position. And maybe there’d still be room to display the numeric parameter value? 
For some inspiration:
I know you can already see the actual knob positions when using the editor when using relative/pass through pot mode, but I guess these pot modes are mainly used when using the synth standalone, i.e. in a live/band setup.