Adjustable extents for some settings. (Cutoff and res. in particular, but may apply to others.) Sometimes the full range of the existing dial isn't really usable. (Goes mute or out of range of hearing, etc.) Having a dial that scrolls within an automatically scaled range between two user defined limits might be a lot more useful. Particularly for those settings where there's barely a microscopic nudge and you end up with a big difference. If the user can tighten up the limits for a dial, and suddenly it becomes a lot more useful and easier to use with much less twitch-factor.

Might be wise to do it from the right click menu, so it stays out of the way and doesn't clutter too much. Of course default range would be the full range for a dial.