As I'm testing working hours, I see how the NFC feature would be extremely useful. I agree with the OP suggestion to set the Workinghours tag with the NFC. But I'll take it a step farther and suggest presetting all fields with the NFC.
With a client organization I will work with multiple staff. With each of those staff members I will conduct a different set of activities that don't vary much. That being the case, for each staff member i work with, I will be be creating 3 or 4 work unit entries that are more or less the same every time. If I could create 3 or 4 NFCs for each staff that completely fills the work unit entry with the description, details, Task, and tag(s), it would greatly simplify my process and standardize/automate data entry.