Not use the clock to my advantage and play the game the way it is meant to be played....even if it isn't a pool game.
I agree you should play the game the way it was intended to be played. That said I challenge anyone to produce a copy of a legitimate ruleset that states games are to be played based on a time limit. Timed games are an aberration as the game was never intended to be played within a specific time frame. Getting philosophical about how the game should be played when you are already engaged in playing it the way it shouldn't seems a bit odd. Kind of like driving 65mph in a 55mph zone and chastising those who are passing you at 70mph.
As soon as they quit playing games with a time limit, coaches will quit managing that aspect of the game. How you manage the clock is another matter. There are certain norms that seem to be acceptable. We regularly practice a "hurry up defense" which we use when we are down and need to move the game to a new inning and an opportunity to score more runs. Basically 1 and down then nothing but drop balls down the tube hoping for a 3 pitch inning. Sometimes we get a jerk that catches on and calls a time out, tells players to tie their shoes, makes substitutions, etc. More often than not they play us straight up.