Using your finger to 'speed read' is especially useful for helping to set the pace, preventing of wanting to re-read what has already been read.
Should you use it? Hey, if it helps to speed read and you feel comfortable with it ... then by all means.
However, keep one thing in mind, the eye is quicker than the hand! If you learn to use your eyes to guide you rather than your finger ... it may be beneficial in the end. Always best to set good habits from the get go.
Congratulation's on becoming a PR'er. Hope to see you on the DB more often.
Michael Saikali