I don't have a trike (coming next month), but a recumbent bike. I am looking at putting a smaller front ring on it (and a bigger one too, since it's a triple), but for me, the really steep hills I need to keep spinning, so lower gearing is a must. The nice thing about a trike is that it doesn't matter how slow you go, you won't fall over.
I will take a couple weeks getting used to my trike, then I'm going to go try some of the bigger hills around here and see what I might want to do to adjust the gearing. I might even get a mid gear installed from Utah Trikes.
There's a guy with a velomobile that has a ridiculous gear range with a triple up front, 9 speed cassette, and a 3 speed (I think) mid-drive that really extends his gear range. He can pedal up over 40 mph, and as he puts it, 'still climb a telephone pole with a good cadence'.
