Another idea:
When long pressing a button (e.g. manual) and moving a slider, show what value was stored in the patch by lighting up the patch and bank selection button lights (similar to how they light up when setting the mod amount). Maybe show the current value of the slider with a blinking light.
This could also be done for the toggle switches (lowest position = 1, middle = 2, highest 3) and rotary knobs (most left = 1 etc.).
While long pressing the manual button and moving a slider (or toggle button or rotary) don’t change the actual value of the parameter. That way you could set the slider to the position stored in the patch without hearing the sound jump. Only change the value when releasing the manual button.