Yes, we could make it optional based on config variable log_pywiki_repo_version , which defaults to False in core.

Isn't log_pywiki_repo_version used only once, to log the version during logging initialization but is not respected
by writeToCommandLogFile() (both in core and compat)

What about adding command value to the config.log and making the default:

log = ['interwiki', 'command']

and then adding something like

if `command` in config.log:
    writeToCommandLogFile()

to bot.py/wikipedia.py

writeToCommandLogFile in core is very new port from compat, and it should have respected log_pywiki_repo_version.

In T98106#1259884, @saper wrote:

Isn't log_pywiki_repo_version used only once, to log the version during logging initialization but is not respected
by writeToCommandLogFile() (both in core and compat)

What about adding command value to the config.log and making the default:

log = ['interwiki', 'command']

and then adding something like

if `command` in config.log:
    writeToCommandLogFile()

to bot.py/wikipedia.py

This also sounds like a good approach to me.

Change 264218 had a related patch set uploaded (by AndyTechGuy):
writeToCommandLogFile() should be optional

https://gerrit.wikimedia.org/r/264218

It looks like this has already been fixed in bot.py. It is now optional via the -nolog file.

This was not working before but will be fixed under T328900.

Change #264218 abandoned by JJMC89:

[pywikibot/core@master] writeToCommandLogFile() should be optional

Reason:

stale patch that cannot be merged - feel free to unabandon if you will update it

https://gerrit.wikimedia.org/r/264218