There is no doubt that the topic of focus in prayer is important. It seems that a book with a brief description of a number of techniques that can help not to be distracted while praying is not useless. Incidentally, the material presented herein may be in one form or another, applied in other areas of life.
Key concepts in communication with God (and prayer) can be simplicity, humility and openness (straightness). Jewish tradition says a lot in this regard and love, trembling before Gd, and reliance on Him.