Anyone touching the balls in the manner you describe is trying to do something. Ga-ron-teed.
I disagree with that blanket statement. Yes, it can be a move for the reasons described, but it can also just be someone trying to get a finicky one ball to freeze.
As an example, I was watching a money game in the Philippines last night (on vacation) and the ref - who told me he was Warren Kiamco's brother - was touching the one ball on the 10 ball rack from time to time - not a single word of complaint from the players.
Gideon