Thanks to everyone for the information.
Well to conclude the current rulings; Cue ball foul only means that anytime the cue ball is disturbed it is a foul, but to disturb a 'single' object ball is not a foul unless there is an effect upon the shot. If two balls are disturbed then it is a foul whether there is an effect upon the shot or not. A single object ball disturbed is allowed to be restored by the opponent. But WPA has it, as my research finds, that two balls or more balls disturbed is not allowed to be restored unless it is caused by outside interference.
Note; be careful as the shooter to not restore the disturbed object ball without getting permission from the opponent, for it will be a foul. For this is not clearly specified in WPA rules. As I stated their rules are wrote for their tournaments and their referees, so the intent is there but hard to decipher.
So the above, plus the members comment about accidently disturbing more balls, is what the rule committee has to work with, although we are not strictly bound by others rules.
For instance; if I execute a shot and I disturb two balls and there is no effect upon the shot, but now those two balls that were once playable into the opponent's pocket are now screwed up and non playable into the opponent's pocket.
Note: WPA does not allow those balls to be restored.
Whitey