How to enable peg selection mode by default in transfrom tool?

I’m a bit of a productivity freak, and I’d love to save split seconds with settings that are not turned on by default on startup, but that I use all the time, say, peg selection mode when using the transform tool. It would make sense for me to turn this on by default. There are more minor tweaks I’d love to do, where can I get more information on config files?