What kind of cursor control do you mean?
You can control the cursor with arrow keys off the bluetooth keyboard, or you can click around with a mouse using Jailbreak+BTMouse stack...
An arrow key to move it left or right one character at a time on the built in keyboard. I tend to hit the n key instead of space bar quite frequently and I don't notice it for a couple of words. Trying to place the cursor with your finger doesn't work too well.