Nah, not really, I can't really exploit it, it's really complicated. I tried everything hahaha, I'll explain.
at v0.0.2, I only managed to trigger Blake's 5 perch quest, but if I were to get out of the store, the quest would disappear from the side quest list, as for the "10 largemouth bass" one, it doesn't register no matter what I do even if I pick "Yes".
So before talking to him, I prepared 5 perch in my inventory, after that, I accepted his "5 perch" quest and gave the fish to him. It works fine for the first time. if I keep talking to Blake, he keeps offering me the quest again, but after completing it for the first time, I can't seem to register the quest to the side quest list again.
at v0.0.3, I managed to register the "10 largemouth bass" one, but it's just not working properly like what I mention in my previous comment. I think both quest would still disappear from the side quest list if I were to get out of the store.