(1) In order to do it correctly you really need a timer and people don't want to invest in one and
Every idiot and his brother has a cell phone these days. If you have a cell phone, you can have a shot timer just by visiting Google Play or the Apple (gag) App Store.
I have a timer app on my Samsung Galaxy that I use to qualify our officers with. The one I use is Shoot Utilities IPSC-USPSA
Google Play I only use the par timer for now and it works just fine. The only improvement they could make is to make the buzzer louder and of lower frequency.
The one I really like is by Sure-Fire, but it's only available for the iPhone (gag).