According to literature review I did so far, agile is methodology and you can plug several things that you feel they are missing, also you can combine different agile methodologies like SCRUM, Kanban, extreme programming, pair programming, TDD and so on, based on your needs, to make them 'advance'. As per my knowledge, standardisation of these methods can not be done in agile, but they can lead us to continuous improvment, if used correctly.