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This might work for things you have to remember off the top of your head, where you have e.g. 10 seconds to write answer, but it doesn't really work when you have longer questions requiring some kind of working which take more than a minute to work out.

I also think that the "extra time for technical difficulties" is going to be very hard to prove or disprove and would lead to very arbitrary decisions.

But this introduces a stronger bias for being fast regardless of wether you cheat or not. That is not always what you want.

They already do this with some tests, both online and in person. If it isn't generous enough, it generally harms folks that are being careful with answers while cheaters can cheat. The cheaters just have to be prepared.