Are Courts allowed to disregard heightened pleading standards and disregard Rooker-Feldman doctrine to avoid analysis of a prisoner's First Amendment claims?

Does a prisoner have a free Speech right to test the validity of another prisoner's federal civil jury trial without cease of penal litigation?

Should this district court have given pro se plaintiff notice of its intent to sua sponte dismiss the complaint and an opportunity to respond, or otherwise should it be allowed to end the complaint?

Does a district court have discretion to allow a pro se plaintiff an opportunity to amend a complaint or dismiss it without prejudice when the complaint fails to state a claim?