What's that about "docking computer always sticks to speed limit"?
Mine - and I have them on every ship - certainly don't. It boosts and rockets through the mailslot at top speed, as long as there isn't a queue.
If I'm actually in a hurry, yeah, then I might rush through the slot manually (esp past queues), and then engage the ADC as soon as I'm through.
But way more often I use the time after dropping out of SC otherwise. I might plan my next trip, or look something up, or leave the room entirely, for instance when one of the cats wants something. All things I can't do while "saving time" landing the ship manually.

If I'm actually in a hurry, yeah, then I might rush through the slot manually (esp past queues), and then engage the ADC as soon as I'm through.
But way more often I use the time after dropping out of SC otherwise. I might plan my next trip, or look something up, or leave the room entirely, for instance when one of the cats wants something. All things I can't do while "saving time" landing the ship manually.