TextEdit MacOS – Saving Files as Plain Text

Many full screen writing applications like WriteRoom and Byword either add a margin to the bottom or support centering the view around the current line.

You could also create ~/Library/KeyBindings/ and save a property list like this as DefaultKeyBinding.dict:

{
    "~p" = (moveToEndOfDocument:, insertNewlineIgnoringFieldEditor:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, insertNewline:, moveWordBackward:, moveToEndOfParagraph:, moveForward:, centerSelectionInVisibleArea);
    "~r" = (moveToEndOfDocument:, moveWordBackward:, moveToEndOfParagraph:, moveToEndOfDocumentAndModifySelection:, deleteBackward:, centerSelectionInVisibleArea:, insertNewlineIgnoringFieldEditor:);
}

After reopening TextEdit, ⌥P should add padding lines to the end and ⌥R remove them.

I think this answer here is what you're looking for:

How does Mountain Lion set the default text editor for the "open -t" terminal command?

To change default text editor to e.g. textmate, execute this command in terminal then restart:

    defaults write com.apple.LaunchServices LSHandlers -array-add 
'{LSHandlerContentType=public.plain-text;LSHandlerRoleAll=com.macromates.textmate;}'