The Mac version is missing a major and VERY useful feature the Windows client has. In the Windows client you can run a key sequence against the connections you choose. Not to be confused with the broadcast option but rather the more targeted method.
For example, if you connect to 10 SSH sessions and then pick a key sequence, the dashboard allows you to run that sequence against, one, three... any or all of the sessions that show in the dashboard. It automatically moves through each session and runs the sequence before moving to the next session. On the Mac you can only run the sequence on one session at a time and it requires it to be done manually.
It'd be nice to get this in the Mac version. Maybe even expand it's functionality on both platforms so that it can act similarly to the broadcast option, just on the specifically selected sessions.