I believe it's incredibly selfish and disrespectful of the other players to leave a chatbot on any server for longer than a round.
I guess I am a selfish and disrespectful kind of guy.
A modified armagetron client, the way you describe it, is really no different than a chatbot.
Perhaps I wasn't clear... it
is a chatbot. One that happens to play better and record certain data for later testing.
Furthermore, it could be debated that any modification to the source code of the client is cheating.
Many things can be debated, that doesn't mean there is any point in doing so.
Obsi ----- It appears that you have your own server running, why wouldn't you use that server to "gather data"

I have multiple servers running and I do use them to gather data. I started out in the puddle though, because the bot isn't very good, and I needed to find a server filled with players that played at or near it's "freshly birthed" level.
Why is it so difficult to consider other players when contemplating something like this.
Consider what about them exactly? If they had not witnessed the bot's progression, from yellow triangle to no yellow triangle, they would have never known it was a bot. It didn't sit in the server spewing racial epithets like Cracker, didn't dig on walls like dev or loquat, didn't rape your mother... not sure what other considerations need to be given.
Do you really believe most people will like playing with a modified client/ chatbot?
Most people believe in an invisible man in the sky watching over their every move, entranced in their little boring lives.
Most people believe in things like ghosts, aliens, psychics, stigmata, etc.
I don't find worrying about what
most people think a very life enriching venture.