It would be great if show trace command will be able to filter captured data (e.g. based on port ,src address, dst address, protocol...) It would be much faster to find desired traffic, for example if we are facing external network on interface we may get 1 desired packet in hundreds of packets that we don`t care about. That also means that we will not need to use external tools for such a purpose (filtering). 

Then it could look like:
show trace filter port 1234 src-address 192.168.1.100

I think that this is a good enhancement that many people can use.