All of these options give me a stomach ache. I wish the NFL just made it easy to purchase a "follow your team" service for live games or even allowed purchase of individual games.
There's a first for everything, even though this actually wouldn't be a first. A better question might be, "How many practice-squad quarterbacks have developed into tradable assets?" (I'm not sure of the answer. I'm just sayin'.)
I don't think there's any denying that it would give anyone pause... but it is practice for a reason and you'd have to hope that he was working on high-risk throws or something. If he did it in a game, that's another story...