Hey,
Dana from Overwolf here :)
Could you please share with me what made you conclude that Overwolf may crash the game?
According to our analytics, there hasn't been any crashing issue with Overwolf running in WoT, and we haven't received any reports about it from users either.
If you have any information that shows otherwise, my team and I would be happy to look into it in order to find out what went wrong.
Thanks!