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No, I also exploited the quick battle on neutral creatures a few times. I used this method to get boots and a cloak that increased speed, and I think I even leveled up Gervulf a bit on hippos. I think this bug could theoretically be used on the last Necropolis garrison as well. For example, if you eliminate the liches in a few rounds, even if it means sacrificing all your troops from the citadel, then you can finish off the vampires and dragons with just lizards in the next attempt.
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I also tried generating a week of dragonflies once, and, surprisingly, the very first attempt gave me a week of snakes. There were slightly more dragonflies in the main castle, but this only backfired, because Cipesco had more of these dragonflies in two castles, and also, neutral dragonflies joined some of the enemies. After that, I didn't even try to generate anything. I just played however I felt like it.
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But you have a great situation with the dragonflies, and many of them even join you. What can I say - you can't blame someone for enjoying a good thing. *:D*By the way, at (105, 60, 0), I skipped 130 flies that wanted to join Taz'ar