Sorry about this, my response turned out a little long, but I wanted to address all your points:
The only things that good and faithful Catholics are required to uphold are the infallible teachings restated in Vatican II.
Catholics must accept with docility the authentic teaching of the Magisterium, of which an ecumenical Councils exercises supreme authority.
Vatican II did not define any new teachings.
Correct, it simply explains and applies various points of the deposit of faith.
Pastoral teachings do not require assent (acceptance) they do require respect as teachings from an Ecumenical Council of the Church. However, that does not mean that on cannot disagree with them and a good and faithful Catholic need not accept them, since they are pastoral not doctrinal.
Yes and no. If the Council commands someone in your state of life to do something, you must do it. If it tells you to refrain from certain behavior, you should likewise refrain from doing that. But yes, you do not have to agree that certain policy actions are best, as long as you always do so respectfully. It’s also good to keep this in mind: the Pope and the Bishops of the world, are far more qualified than you and I. Likewise, unlike us, they are authorized by God to make these decisions. So, unless in good conscience you can’t agree with a certain policy, to me, proper humility would say give them the benefit of the doubt.
Ecumenism - The Church can choose how it is to deal with other religions.
Ecumenism (dealing with Christians), like evangelism (dealing with non-Christians), has always been a mission of the Church (even if the term wasn’t used necessarily). But, just with evangelism, there are many ways to share the truth and foster true Catholic unity with separated Christians. Just like St. Paul said, we should be all things to all men. Different approaches should be used for different individuals and groups.
Religious Liberty - Circumstances in our times may change the need for suppressing certain religions and controlling governmental religion.
Religious Liberty is a little deeper than that. It is not a time-specific issue. It is a truth and a norm for the Church’s actions–the assent to faith
must be free from coercion–this is limited, however, when it comes to state action (as the Council taught). As prvious popes forcefully explained in light of radical Liberalism, the state can intervene if necessary to preserve a just ordering of society–the catechism explains well referencing past popes:
**2108 **The right to religious liberty is neither a moral license to adhere to error, nor a supposed right to error,37 but rather a natural right of the human person to civil liberty, i.e., immunity, within just limits, from external constraint in religious matters by political authorities. This natural right ought to be acknowledged in the juridical order of society in such a way that it constitutes a civil right.38
**2109 **The right to religious liberty can of itself be neither unlimited nor limited only by a “public order” conceived in a positivist or naturalist manner.39 The “due limits” which are inherent in it must be determined for each social situation by political prudence, according to the requirements of the common good, and ratified by the civil authority in accordance with "legal principles which are in conformity with the objective moral order."40
37 Cf. Leo XIII, Libertas praestantissimum 18; Pius XII AAS 1953, 799.
38 Cf. Dignitatis Humanae 2.
39 Cf. Pius VI, Quod aliquantum (1791) 10; Pius IX, Quanta cura 3.
40 DH 7 # 3.