So if you activate clicks via mouse then it won't really work for people who are eating? :D 

Also, I will say I really like the idea. 

However, I am a little worried that it won't be super comfortable for the user to be swinging their head around while chewing their mouse and tensing up their face just to quick-close a youtube ad. 

I just saw that you had the same idea I had - but some time earlier! Though I don't know what's the status of your project. Are you still working on it? Meanwhile I did a first prototype and will update my project https://hackaday.io/project/161560-imu-based-hmi-headset soon.

Wow, that's cool！ I already finished the prototype of this headmouse, and I am working on another project "the touchmouse", which combined the advantage of  touchpad gestures and the high accuracy of normal laser mouse，and the mouse is only 70x30x10 size. we are trying to make it into a product.

Wow, that's great! Would be nice to be notified when your headmouse or touchmouse is ready to be bought (or kickstarted or similar...).

I am thinking to provide a easy and cheap DIY version of this kind of headset - lets see how it develops in the next weeks and months...

I will support your DIY, and I will tell you about my experiences on the HeadMouse Project. I posted the DIY process onto the DFROBOT website:http://mc.dfrobot.com.cn/thread-26626-1-1.html You can take is as a reference 

For the project of "All Touch Mouse", we will launch the crowd founding on KS of IDDG, I will let you know then :)