As I am trying to get most out of the images it does not make much sense to me to work without a visual control mechanism as every image needs different parameters to get most out of it. So, no, at the moment there is no batch tool available.
A WordPress plugin is on my todo list for a loooong time but unfortunately I can't say when it will see the light of day.
Here it is, the brand new SVG Compressor: compress-or-die.com/svg 🌟 It's actually based on "svgo", but I added an "Extreme compression" option which reduced the file size by 6 to 16% in my experiments. At the moment it is experimental 🧪 and I appreciate your feedback.