Kneeling during the Consecration:Clear guidelines
Chapter II #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, at every Mass the people should stand from the beginning of the entrance song or when the priest enters until the end of the opening prayer or collect; for the singing of the Alleluia before the gospel; while the gospel is proclaimed; during the profession of faith and the general intercessions; from the prayer over the gifts to the end of the Mass, except at the places indicated later in this paragraph. They should sit during the readings before the gospel and during the responsorial psalm, for the homily and the presentation of the gifts, and, if this seems helpful, during the period of silence after communion. They should kneel at the consecration unless prevented by the lack of space, the number of people present, or some other good reason. (emphasis mine)
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.  But the conference must make sure that such adaptations correspond to the meaning and character of each part of the celebration.
APPENDIX 1: APPENDIX TO THE GENERAL INSTRUCTION FOR THE DIOCESES OF THE UNITED STATES OF AMERICA
21. ACTIONS AND POSTURES
At its meeting in November, 1969, the National Conference of Catholic Bishops voted that in general, the directives of the Roman Missal concerning the posture of the congregation at Mass should be left unchanged, but that no. 21 of the General Instruction should be adapted so that the people kneel beginning after the singing or recitation of the Sanctus until after the Amen of the Eucharistic prayer, that is, before the Lord's Prayer. (emphasis mine)
Unusual circumstances do not exist at my parish. We have room. The church is not overcrowded on regular Sundays and daily Masses. There are kneelers for every pew (just not for the few chairs). So ... we should be kneeling, not standing during the Consecration.