I would like to have a command to wake up all sleep units of the given types (like the Shift-U to upgrade all). This will make it easy to wake up the sleeping workers or all Cavs to send them to front line without searching every city for them.
I would be great if there was a command to wake all tanks in all cities on the continent, but I think it will also make it more annoying if you had to wake up all your tanks all over the world, but a "continent wake-up" would be really great to have
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Yes, waking up all units of a given type would be very useful.
Related, Age of Empires had a very handy "Find Idle Worker" button. Press it and it would select one worker who was not doing anything if one was available. This would be nice too.