No, it is not possible to change it.
I agree that it comes too late to help and would like to see it changeable too.
They suggest that you email them with suggestions. They don't appear to have anybody assigned to pulling suggestions out of the forums although they will occasionally pop in and surprise you.
I get a 'short of time' alert when my clock reaches 20 seconds left - is it possible to change the value (I'd like it to appear at 1 minute)?
I've had a look through the Settings but couldn't spot an entry for it.
Thanks.