Due to popular demand, here's another video tutorial about a command from the Options.txt as part of the series "Ableton Live Insider Tips". This one is brand new and only works in Live 9. If you ever wanted to have a way to arm tracks on fly, this one is for you:

Download the Options.txt file with the commands from all the video tutorials (Right-click and choose Save Link as) Don't forget to only keep either -NoAutoArming or -EnableArmOnSelection as they conflict with each other.

Do you have questions or suggestions? Leave me a comment.

Missed the other tutorials in the series? Start with the first, Options.txt Part 1. It explains all the basics.