Andrea, I am still trying to understand it too and will let you know as it is not currently documented in the manual.
1. around page 140 in the pdf manual, I noticed the "Overwirte Plugins" is missing the word "plugins" and is just the overwrite like the preceding overwrite. 
2. Timecode option for the Edits Popup is not actually documented anywhere and is not in the Shortcuts either.

On Sat, May 21, 2022 at 3:33 AM Andrea paz via Cin <cin@lists.cinelerra-gg.org> wrote:
I don't understand how this option works and what it is for; however
compiling the latest git I have these results:

MMB on edit and then "Timecode" --> Ok
MMB on selected edit and then "Timecode" --> OK

ctrl + ! (shortcut) on edit --> OK
ctrl + ! (shortcut) on selected edit --> OK
--
Cin mailing list
Cin@lists.cinelerra-gg.org
https://lists.cinelerra-gg.org/mailman/listinfo/cin