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I'm with about everyone else here...
Unofficial signals can be OK as long as they aren't conflicting or confusing.
The "Travel on a throw-in" is absolutely mis-leading signal. It perpetuates the myth that it is possible to travel on a throwin.
The block-tip can leave the crew with egg on its face when another official calls the foul. I think this signal should only be used well after the action and only in response to an inquiry from the coach. After 2-3 seconds, you can be certain that your partner is not calling a foul. And guess what, the coach just might not be disagreeable to start with making it unnecessary.
The not closely guarded signal that is often used, I think, is actually quite informative and helpful. It indicates to the coaches that you haven't forgotton to count, just that you judge the distance to great. I can't think of any potential confusion or mis-understanding that is possible here.
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