Cannot paste a screenshot here, will try to explain:
Tools menu/Options item opens a dialog.
On the General tab of this dialog, there is an option (3rd checkbox in the Misc section) called Check default remotes for updates every  minutes. This is the one I mean.
(I have windows, might look a bit different in the Mac version.)
I don't believe Git provides a tool for this, so SourceTree will likely not either.
Consider creating a feature request at jira.atlassian.com and posting the link to the request here as an answer. However, since Git does not support the feature, I don't expect Atlassian will either.
I think that my feature might be misunderstood.
I mean something like "pull from all repositories". So it's a matter of SourceTree not Git. How I can see this implementation is to run `git pull` for every repository with one click (in a simple loop or in seperate threads).
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