Not exactly what you are requesting but maybe this info will help…
The mixer peak values can be set to “Hold Forever” or “Hold Peaks”. These options are found in the mixer functions menu (drop down arrow upper right of mixer.) If “Hold Forever” is chosen you can reset all the meters by clicking on one of them. If you choose the “Hold Peaks” option then the peaks are held for the time you specify in the CB general preferences (File>Preferences>Metering) menu.
Regards 