I am back into SH 5 - is there a zoom key for the deck gun optical?

Finally, I recall back in SH 3 someone changed a cfg file to allow running with decks awash but diesels running.. great for speed with low visibility..

still possible? When I try to run at 7m depth in the VIIB my crew shuts down the diesels. Though it might have been the IXB where I did this before.

Finally, I can't seem to run the sonar station manually for listening.. used to be NP in SH 3. Is there a fix or am I missing something?

thanks!