It's been my experience, Coach Mike, that 10U rules are frequently adjusted locally. Putting it another way, most 10U games I know of are not played using strict ASA Championship Play rules (i.e. the rules in the book).
Q1: I suspect your question is a per-inning run limit question. There is no such rule for ASA, but most 10U leagues have such a limit, frequently 5 runs. It is also possible that a local rule exists limiting the number of walked-in runs. You'd have to ask your local league or tournament officials.
Q2: Many times 10U leagues / tournaments will adopt an unlimited defensive substitution / bat the roster rule. In this situation, there may be no limit on pitcher's leaving and returning in the inning. It would depend on how thoroughly they thought through the local rule. Otherwise, the explanation Glen gave you applies with one exception: if the players coming in to pitch are already playing defense in another position, it is not a substitution.
Q3: What Glen said.
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Tom
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