This is actually something I’ve been meaning to vent about with 2.x but have just never gotten around to it.
The UI element for setting the height of the grid row height would be much better if it was a plain text box or (preferably) a numeric text box with a spinner dial. It is technically possible to set it to any value from 16 to 70, but first, it’s hard to estimate exactly where the slider needs to be since the control is so small (Fitt’s Law strikes again!), and second it tends to jump by twos so getting an odd number when it’s currently on an even number or vice versa, while possible, takes some fiddling.
I’d very much prefer to just be able to enter “15” if I want rows that are 15 px high, or “32” for 32 px high, etc.