Well silly me, I guess I kinda hoped they might make some exceptions considering people did volunteer work for good causes. My kids couldn't get themselves to WDW on their own, so they had to wait for mom and dad to bring them. They can do whatever they want, even if it is "clearly stated" on the certificate. Just like it's a unadvertised fact that they do not penalize a child for growing older and will upgrade an unused child's ticket to an adult ticket once the child is over the age of 10 or whatever the adult age is.
At least I have the satisfaction of knowing my kids did something to help someone else and that is why they earned that certificate, it just kinda stinks they would put an expiration date on it, especially when it's not like the certificates could be given away to someone else to use, an id was required when the certificate was redeemed.