By default when you precompose a layer the new comp name is auto-filled as the layer name with "Comp 1" added as a suffix. I prefer "precomp" to be my suffix. It might seem like a small thing, but in projects that I'm precomposing a lot it would save me some time to have the default name match my preference. Is this possible to change, even if I have to modify a .txt file?
There is no preference setting for that. My personal preference is to use the keyboard shortcut to create the pre-comp then just start typing then press the enter key and I'm done.