Training Expiration Dates

I have noticed that many of the trainings that you can attach to people do not have an expiration date (First Aid, Red Cross First Aid, etc.) when the actual certificates do in fact have expiration dates.

Even if the training expiration date can not be calculated automatically by the system would be nice to have a field that we can manually populate. This makes it hard to pull reports to show those who have expired certs. Would be nice if they all had expiration dates but I am mostly concerned about the First Aid ones at the moment.