You can move the cursor very fast by turning the keyboard into a touchpad. When you are ready to edit, before sending, TOUCH & HOLD the Space Bar on the Keyboard. This will allow you to move the cursor as if it were moving on a trackpad. Details below:
How to bring up the secret trackpad on an iPhone or iPad (Source: CNET)
Here's how to discover the hidden trackpad on an iOS device.
1.Anywhere you've written a block of text, bring up your keyboard and press and hold your finger down on the space key until the keyboard goes blank. You should feel a bit of haptic feedback and see the cursor enlarge for a second, which means you can now use the keyboard as a trackpad.
2.With your finger still pressed down, move it around the entire keyboard to move your cursor, just like you would on your Mac's trackpad.
3. To place the cursor, simply lift your finger off the screen. You can then use any of the other keys, like Delete, to make any edits in the text. If you want to move the cursor once again, press your finger down on the space key to bring up the hidden trackpad.
Axel F.