I had a thought today, what if the Spies in TF2 could be used to counter enemy spies? Idea is this: unlockable upgrade for Spy which would allow you to exchange your disguise kit for some glasses or something which would allow you to see through other spies disguises and cloaks. Just to give players the option of changing its role from spy to counter-spy, allowing them to warn teammates of potential threats and getting rid of the frustration of having a single spy wipe out half your team. What do you think?