The "autosync" setting:

This setting determines when autosync occurs. The setting is a string that provides a lot of flexibility for determining when and when not to autosync. Examples:

on

Always autosync for command where autosync makes sense ("commit", "merge", "open", "update")

off

Never autosync.

pullonly

Only to pull autosyncs

all

Sync with all remotes

on,open=off

Autosync for most commands, but not for "open"

off,commit=pullonly

Do not autosync, except do a pull before each "commit", presumably to avoid undesirable forks.

The syntax is a comma-separated list of VALUE and COMMAND=VALUE entries. A plain VALUE entry is the default that is used if no COMMAND matches. Otherwise, the VALUE of the matching command is used.

The "all" value is special in that it applies to the "sync" command in addition to "commit", "merge", "open", and "update".