In 2002 a new Latin edition of the Roman Missal was published. A new instruction in this GIRM is that each Conference of Bishops is to have a different GIRM. From the USA edition:
“390. It is up to the Conferences of Bishops to decide on the adaptations indicated in this General Instruction and in the Order of Mass and, once their decisions have been accorded the
recognitio of the Apostolic See, to introduce them into the Missal itself. These adaptations include
• The gestures and posture of the faithful (cf. no. 43 above); …”
So the Australian Conference of Bishops will have a different Missal, with different instructions, to that of the USA, Ireland and England and Wales. The 2002 GIRM has been published for the USA and can accessed from
romanrite.com/girm.html , The England and Wales one can be downloaded as a PDF from
catholic-ew.org.uk/liturgy/Resources/GIRM/Documents/index.html . Ireland has published one, but I have not found it on the internet.
But Australia does not have one yet. Elizabeth Harrington wrote at
litcom.net.au/liturgy_lines/displayarticle.php?llid=435 “The version of the General Instruction approved at the November 2002 meeting of the Australian Catholic Bishops Conference is still awaiting confirmation by Rome. When that is received, the Australian Bishops will establish a timetable for its implementation. Then each Bishop will implement it in his own diocese.”
If one is published tomorrow, with a rock solid instruction for lay people to kneel for the whole Eucharistic Prayer, you will be in a clearer position to tell the priest it is an abuse to encourage lay people to stand.
But today the situation is more difficult. What is the authority? Customs people are used to? Directions of the priest? What was decided around 1970? The directions given in Latin in 2002?
One approach is to find a 1975 Daily Mass Book (E.J. Dwyer, ISBN 0 85574 289 5, Sydney, 1975) like I have shown at
romanrite.com/j290102.html . It has clear directions about when to kneel, stand etc. It can be an authority to show to the priest in any discussions.
Another approach is to accept the 1975 GIRM:
“21. For the sake of uniformity in movement and posture, the people should follow the directions given during the celebration by the deacon, the priest, or another minister. Unless other provision is made … They should kneel at the consecration unless prevented by the lack of space, the number of people present, or some other good reason.
But it is up to the conference of bishops to adapt the actions and postures described in the Order of the Roman Mass to the customs of the people. …”