It would be very nice to be able to right click on the current highlighted file and "send to" or "Open With". Specifically mp3DirectCut, to trim various noise from the beginning and/or end of a file.
I just discovered that I can drag the file to the open mp3DirectCut
You can access any other application from within Mp3Tag by creating a Tool to do so.
Menu bar > Tools > Options > Tools
Create a new Tool there:
Name: whatever you like (e.g. mp3DirectCut)
Path: the path of the .exe file of mp3validator on you system. (e.g. C:\Program Files\mp3DirectCut\mp3DirectCut.exe, but you have to look it up yourself)
You have quick access to the tools by pressing ctlr + 1-9 with the each number representing a tool in the order they are listed.