If you place the cursor anywhere on the bearing dial at the hydrophone station and left-click, the hydrophone will sweep to that bearing and stop. IIRC, you can click-and-drag the bearing pointer also.
Sorry, but I don't know about the Typ IX. Someone around here will, though.
H.sie's and Stiebler's patchers are good, and I think Hitman's optics gives you the most historically correct scopes - FoV, power, and reticles. It doesn't match the movie, but it does match existing WW@ optics.
Best single addition for realism, IMO, is voice command. Download sh3speech here:
http://knepfler.com/shSpeech/. It takes a bit of cutting and fitting to adapt it to whatever GUI you are using, but the basic commands work right out of the box. Get a cheapo headset for under $20 from the Shack, and you're in business. WW2 subs were not controlled by a keyboard. The CO gave orders and the crew carried them out. sh3speech let's you run SH3 that way, and it adds a whole new dimension of immersion.
"Ahead one-third. Periscope depth."
"Jawohl, Herr Kaleun."
Or, if you're fluent enough, you can give all your commands
von Deutch.