Some way to make the spy a little bit easier to play. I'm thinking maybe 1.5x normal speed for spy (for they can catch up and backstab the faster classes they are following around).
Or maybe increase the damage of the knife, when stabbing from the front, because normally the front-stab damage is very weak. Maybe make it as strong as the engi's wrench.
Maybe longer cloak (invis) time? Or maybe even some way for you to select what name you want to show up as to the enemy instead of a random name.
Is it possible to do anything here with an existing plugin, or modifying the server files right now?