I don't know what you mean by "quick thumb adjust". If you are referring to a one pin sight, I can't be of much help, yet. I have ordered an HHA Optimizer 5000 and it should arrive today. However, this will be my first sight of this type.

I have been using a Spot-Hogg Right On which is a 5 pin sight. This is a very rugged sight with great adjustability.

Good luck and I hope you get more responses to your question.