> When I was playing a Counter Strike web app example posted here a few months ago, it was endlessly frustrating to have Control and W mapped to actions that you may want to perform simultaneously while also not being able to suppress default behavior. I kept accidentally closing the tab as a result...

So play the native version - problem solved.

This drive to accomodate people misusing the web for apps just bloats browsers (making it prohibitively expensive to develop alternative implementations) while adding tons of privacy leaks and attack surface for exploits.