I would say...many people create their own rules not really knowing the "official" rules which has been done in pool, ping pong, darts, and so forth as long as those games have been in people's basements
many of these people don't care about the "real" rules...bars are like this all accross the US...just got into a hugh scabble this last weekend when a bar player got mad that we were inforcing official rules when he thought his bar rules were enough
it is simplier with foosball than many games/sports because right now there is only 1 set of "official" rules and they are the same all over the world...pretty unique really
if you don't want to play by the official rules or tournament rules, there is nothing anyone can say to argue one rule is better than another but the players just need to agree on how they will do it...nothing wrong with this if you are just playing for fun but don't take that made up set of rules to someeone else and try and make them believe they are the "right" rules...the only right rules are the "Official" rules
here is the link if you want to search for a specific rule, print them off, and/or learn them
International Table Soccer Federation (ITSF)
http://www.table-soccer.org/rules/documents/ITSFRulesEnglish.pdfthe specific answers to your questions are below taken directly from the ITSF rules
this is all that is said about two hands23.4 It is legal to have just one hand on the rods when playing defense (example: right hand on defensive five-man). It is also legal to use two hands to move one rod (example: defensive five-man). Excessive switching of the hand between the handles may be judged a distraction.
here are several other statements about hands on the rods14.3.1 In any doubles event any player placing their hand on any rod normally designated as one played by their partner while the ball is in play shall be judged as a distraction violations.
20.4 It is considered a distraction, after setting up a shot, to remove a hand from the handle and then immediately shoot the ball. The ball may only be shot after both hands (and/or wrist) have been on both handles for one full second.
20.4.1 In singles, rule 20.4 only applies to a set shot on the three-rod.
and last here is what are the rules on Scoring12. Point ScoredA ball entering the goal shall count as a point, as long as it was legally scored. A ball which enters the goal but returns to the playing surface and/or leaves the table still counts as a goal.
12.1 If a point is not counted on the scoring markers and both teams agree that it was previously scored and inadvertently not marked up, the point shall count. If both teams do not agree that a point was scored and not marked up that point shall not be counted. Once the next game (or match) has begun no appeal can be made and the point shall not count.
12.2 If there is a controversy over whether or not the ball entered the goal, an official should be called to make a ruling. The official may make a ruling based on information received by the players and/or spectators. If the information gathered is inconclusive the point shall not count.
12.3 Any team intentionally marking up a point not scored shall not get credit for the point illegally marked up and shall be charged with a technical foul. Further violations of this rule will be grounds for forfeiture of game or match (to be determined by the Head Official).