If you learn the right technique, touchpad mode works consistently 100% of the time. Problem is, Apple doesn't teach the finer points of using it. I had do do some looking around for tips to figure it out. Do it this way:
- Bring up the keyboard and let the cursor start blinking
- Place your thumb lightly on the keyboard, hold it there, then do the equivalent of a "mouse click" by briefly applying more pressure then releasing (without lifting your thumb off the display). That activates touchpad mode.
- With only a light touch, slide your thumb around to move the cursor.
- To enter selection mode, do the "mouse click" again, then lightly slide to select text. Or you can do repeated "mouse clicks" to toggle select word, select paragraph, selection mode off.
This approach works for me perfectly all the time.