Require confirmation of recognition

Hi, first of all: many thanks for this little peace of code, great work!

I do currently though have slight security concerns about using it. I do not fear abusive colleagues or me mistyping sudo, but a peace of malware code that tries to execute sudo. Just because I am sitting in front of the laptop does not mean that I want everything that tries to execute with sudo to be executed with sudo.

Is it possible to add a required confirmation before the face recognition is successful? This can be as little as pressing "Enter". So the face get's recognized and then "Enter" has to be pressed to proceed.

This would allow to be sure about what actually uses sudo and what should not.