No argument here, way too much clicking and dragging involved to do anything in a hurry. I've often said we need a hotkey command, "set all fish to 25 feet high speed, open all outer doors", rather than having to click and drag and Q each tube individually, wotdahell am I carrying all these crewman around for if I gotta do everything myself, I'll make all you scurvy dogs walk the plank.

No, I was thinking more on the lines of a daily trim dive, take her down to 150, stop the motors and let her drift to a stop, pump and flood trim tanks until she stops rising or descending or tipping fore and aft for a few minutes. Once that's done the trim is set for the day, wouldn't have to tinker with it in the middle of an attack unless you had flooding from damage or something after getting depth charged.
For those who are unaware, the external ballast tanks are all or nothing when you dive - you would partially flood the external ballast tanks to get a "decks awash" trim, but when actually diving they're flooded completely, no air in them at all. The trim tanks are inside the pressure hull, those are the ones that are partially filled or emptied to get a trim. US fleet boats also had a negative tank which was normally flooded for quick dives, then "blown to the mark" before reaching periscope depth to get that neutral buoyancy. They also had a bow buoyancy tank that was blown when surfacing to get the bow up in a hurry.
Creating full management for all that would probably not really add much fun factor, but taking away the invisible concrete blocks that hold you at 60 feet with zero drift would add realism and be more fun in my opinion. Silent running at 230 feet drifting deeper slowly, here come the depth charges so we can make noise for a few minutes, all ahead flank, pump 500 pounds from the main trim tank to sea. Slow down after the depth charges subside, now we're a little lighter but still can't hold at 1 knot, can we pump out another 200 pounds or so? Not yet, pumps make too much noise, increase to 2 knots and see if we can hold depth at that speed. How are we doing on that after torpedo room bulkhead? 30 more minutes and it's still flooding? Okay, can't run pumps and give them a steady noise to get a bearing on, better a quick blast - blow the after trim tank dry next time one of them tin cans passes overhead.