I use option and command to navigate text (which is awesome). I've read somewhere that you can specify the characters that constitute a word stop (underscores for example). However I can't find this anywhere.
Does anyone know where to set this?
You can choose between a few settings in System Preferences, but I don't know any way to customize them.
The standard setting treats period and colon as part of (some) words.
ASCII special characters that are part of words:
ASCII special characters that are not part of the start or end of words: