Thumb operated AR15.

https://ironhorsefirearms.com/iron-horse-rifle-dmr-classic/

That makes way too much sense.

Need to get Glock to incorporate this to solve the trigger error problems on pistols.

I've always wondered why the trigger designs have never incorporated a more push-button motion to reduce errors caused by the trigger finger.

I just always assumed the current trigger was the best of all possible trigger designs. 

From a safety viewpoint, there does need to be a place to rest the trigger finger/thumb away from the trigger.

Waiting for the FireFox trigger -- when you just have to think to make it fire (but not limited to thinking in Russian words  ).