This won't work. Almost all forms of autocross guarantee a driver 3 runs (each driver does one run, then each driver does a second set, etc.). Knowing what time you have to beat after each run is a huge part of autocross. The data has to be input in real time, or at least close so that results can be viewed after each run. This problem gets worse with ProSolo, where there are two courses and challenges require results for a class to figure "handicap times". Additionally, multiple cars are on course at one time (generally like 3), so it's very difficult for one person to do.

In my region, we have some open source custom software that a local member wrote that works pretty good and automatically inputs the times as they come in. I've modified the software to make entering our timing cards faster, but we're a bluetooth bar code reader and some business cars away from having a very streamlined process.

The other thing the author of the original question is missing out is how penalties for hitting cones or missing gates is entered. There has to be some human interaction there. If my region didn't have timing cards, we trusted the computer and the operator completely, we could have 1 person running timing, instead of 2 (I'm not counting the announcer or course control). National level SCCA autocross handles this problem by having someone with a bar code scanner standing near the start line that scans a bar code on your helmet as you drive up.