Force play or time play?

[jicecone]

"An appeal should be clearly intended as an appeal, either by a verbal request by the player or an act that unmistakably indicates an appeal to the umpire"

Given the rulebook language quoted above and not having a copy of JR, how is the runner returning to second any different then the runner returning on a tag up or missing home plate. They are both unrelaxed actions and both appealable errors. How does JR justify this . Or am I missing something.