Fine adjustments work nicely on e.g volume faders in the mix window or in the output window (lots of movement for little changes).
This should work for plugins as well, e.g for the frequency pots of the EQ3-7Band.
It would enable better frequency sweeps (e.g. for offending freqs); the present "jumps" are too big.
A mouse-move of the pot or a mouse-move of a control point in the frequency graph or a scrollwheel-move, all those 3 should be finer with Ctrl(Win).