On most of the map you can more center on the stuff you want to check, and the q/k/t/d cursor will appear near the place you want to operate on. PROBLEM: not so at the edge of the map. Since you can't scroll past your, say 2x2 region, the whole border of your fortress requires extra scrolling in "slow mode" to do anything.
SOLUTION: add some fog/unexplorable tiles beyond the limit of your fortress, so you can actually scroll in fast/regular mode to center on the outer tiles of your fortress.
Edit: this must really be annoying me, since I already suggested it a few years ago
and didn't remember it.