I need a new function to this fantastic program!

I need a summarized value (eg. mp3 duration sum) to show in the bottom of the file/dir list for [WDX] plugins (MediaTime) after the sum dir/file length value.
The MediaInfoLib and the [WDX] MediaTime plugins can write the duration value in the mp3 file wdx calculated column, but the summarize value of the duration in one directory files, not possible to write, because the WDX plugin cant write value the bottom of the file list, where summarized the actual directory file/dir sizes.
At now the plugins can write the summarized mp3 duration only after the dir, but, when I go into the dir the WDX plugin can't write anywhere the sum value.
It will be very helpful for me, because now I need every time to run other program (mp3tag) to calculate the dir summarized mp3 duration value. If it will possible the value show in the bottom of the list, I will please the Mediatime plugins developer, to write there he summarized value.
printscr for the my problem:
https://drive.google.com/file/d/1DWUrNpzU3Za62Zt8Rzk6KTV8wHBDGihq/view?usp=sharing
Thank you very much!!!
