I believe we had one of these "somewhere else" so I thought I'd bring it back since as I said, we have some quality players on this server and I'm sure we can come up with some good suggestions for game play. Here's a couple I'll toss out there:
-Bring back feign death for spies
Always thought this was interesting and could be useful to the right people, especially when used along the w/ cloaking.
-Possibly a little more health for the engy
Not a big upgrade, maybe just up to 150 or something, but it seems in the article that even the TF2 team worries about them getting steamrolled with their sentries. Could at least give them a little more of a fighting chance.
-(Just for me) Get rid of the sticky shooting bs
For obvious reasons. First the pyro can blow them back at you, now they can be shot. Only good for idiots spamming the battlements so the snipers can do a little house cleaning.
*More from me later
*Edit
Not much more to add yet, but just thought to toss on that Valve wants something new to possibly replace the disguise. Again, going back to the article, they think it has just about run it's course which is interesting.