Well, they haven't fixed the bug where artifacts are sold at inflated prices across all patches, maybe this one too. Players like vbn and Ataman consider it a bug, and I'm inclined to agree. But to simplify checks, you could allow it, although there's a catch: ArtMoney. You wrote to me in chat about a record of a 5-hour battle. (By the way, clarify if there was a supply cart there???) So, did you personally witness this battle live, or was it just written to you in a message? You can complete such a battle in five minutes. You can change the time in the save files at the beginning and end of the battle. Then write in a message that you fought for 12 hours straight. What do you do then? How do you check?

You can only check it one way: by banning the ballista. Because, as you wrote above, if there's no skill, it shoots on its own, and we can't prevent that... In the case of slow units, personal control isn't very important.

You can track the money bug with detailed descriptions and daily saves. If an extra 5-10k is taken, it will be noticeable.

P.S. I witnessed that battle live; I was playing Varik next to it for the last two hours. There was no supply cart (on version 4.0, I personally checked just now that the shots don't run out; if you place a supply cart, the shots stop decreasing, just like with any archer).

P.S.S. Buy one enhanced fairy and spend a week of real time killing 1000 zombies with it... Is that also a bug? And how do you check it? Don't look for more problems; there are already plenty. Leave the ballista alone.