Experienced 1pocket player, when playing for actual money, will usually discuss/negotiate *at least* three things before the first ball is hit:
How will sleepers be handled? You snooze you lose or will they be put up when they are noticed, after each player has had an inning?
Are we playing" three consecutive fouls" is loss of game?
And, are we playing "base of the ball" or the whole ball?
The reason is every room has slightly different rules and even if two guys are from the same room, a discussion of these and other factors (like are we paying after each game or putting them on the wire) helps things go smoothly. Don't clarify these issues beforehand at your own peril.
Lou Figueroa
Never heard of location of ball to be anything to negotiate outside of playing begginers and bar bangers. You may as well argue about what ball numbers are "stripes". Or about no rail contact after a hit.