Bush league? That means tacky, amateur, unsophisticated.
Anything that is in the rules, or lets say not against the rules, is good. Assuming what's occurring is not construed as cheating. And streaming isn't unless it's prohibited via the league rules.
A quality manager will and should use everything he can to pull off a win, and in some cases streaming can pull 2 of 5 standard pitching categories. Assuming he dominates on the offensive side, and has a weak pitching core this is a very good H2H way to win a week (and a half).
Example: Personally I'd say if Romney DIDN'T know how to legally get away with paying less taxes, then he definitely shouldn't be our next president. I'm not agreeing or disagreeing with that sentence, just pointing out if the rules make someone able to do something, and they will lose out if the refuse or are to stupid to properly use what they've been given to work with then that would be more 'bush league' to me. You wouldn't want to win against a scrub who just lets you win, would you?