On the branches panel there are two fields 'behind' and 'ahead' that show how many commits each branch is behind or ahead of the main branch.  I'd sort of hoped that clicking on either of these bars would take me to a panel that listed the actual commits. 

It seems you can get to the 'commits ahead' panel by clicking on the branch name.

Any chance this could be linked to from the 'ahead' field? 

If you make a panel for the 'behind' commits, could it be linked to the behind field?

See: https://community.atlassian.com/t5/Bitbucket-questions/How-do-I-tell-which-commits-a-branch-is-ahead-by/qaq-p/1216187?utm_campaign=&utm_content=post&utm_medium=email&utm_source=atlcomm#M48949 for background.