Lets you close the annoying revive window so you can actually type
The MvM revive window is a horribly designed modal dialog that steals all the keyboard input, preventing you from doing basic things like typing into the chat box whenever it's visible.
This mod adds a "Hide" button to the revive window, which makes the pesky window go away but doesn't stop the revive. By closing the window, you give up the ability to decline the revive later on, but you gain the ability to actually use your keyboard while you wait.
May conflict with custom HUDs that customize the MvM revive window.
Diff of stock hud file vs modded version: