Check USCIS processing times for specific guidance.

Yes you may do so while the I751 is pending.

No not at the USCIS stage of consular processing.

Yes this is possible to apply for advanced parole given status.

It appears there is no action that is needed currently.

DACA should he indicated for current status.

You can inform the officer at time of interview.

You can submit the I864 with the I485 but will need a cosignor.

Yes this is possible if timely filed.

No this doesn’t impact the decision.