re: 'What would thoughts be about getting an additional gradebook option, or course completion option, which means if you do the course again, then you get the gradebook and completion date updated with the later date?'
Sounds as though there is a need in moodle, but also some alternatives that can be considered.
Two things then, that may be food for thought:
1. Normally First aid courses and similar courses are accredited and therefore updated by the awarding bodies. This means that I am not sure if there is anything needed more than a simple record keeping system in moodle....this sounds akin to the observation thread elsewhere-to log stuff for recotrd keeping-maybe, of course.
2. I am wondering if this type of thing add gradebook option/course completion option in relation to the need outlined, was an apparent biggie in the recent gradebook survey outcomes/data.....that might be useful to know.