So A & C, are you saying that a Swiss army knife is an excepted "tool" to do a walk around.
My Leatherman brand multi tool has one razor sharp strait, one just as lethal serrated and one saw blade on it. As an AMT (LAME) in the USA it is generally accepted and I would clearly understand why it would be needed in the GA world by a pilot. Every major airport here has some sort of procedure to get the tool on the field, going back and forth through security becomes an issue. I understand in other parts of the world an additional "tool badge" is used but if possible we try to keep knives on the field. I would suggest a GA pilot leave a swiss army knife or multi tool in their aircraft if feasible.