This excellent idea was proposed on the greek forum, by another player, but the problem exists on all servers so I will suggest it here and would like player's and support's feedback.
The bot problem and the solution. No big secret that bots exist in the game and a solution is a pop-up, a captcha every hour or every 30 minutes. When there is no response to the pop-up, in a valid time 5-10 minutes, the account is logged off automatically. Meaning that a human has to log on the account again.
Would like to read your ideas.