This is what I get for moving... I miss interesting topics!
In discussions with my friends, I proposed the upgrade to the PDA being a new buidable:
THE BARRICADE:
Specifically "D", the one with the humorously blinking light. I'm too lazy to find a better picture.
The idea is simple: It's the same dimensions as a dispenser, so it has the same "stopping power" as the dispenser. Unlike the dispenser, though, a sentry gun can lock on and shoot through it, and enemies can shoot through it the other way (exceptin' the random bullets that would hit the barricade). It has 150hp. Useful for covering an Engineer's side, or making it difficult to get within sappin' range of a piece of equipment. Also useful for delaying pyros (they have to jump, or walk around, or burn, the barricade) and other unsavory figures from getting to the sentry.
We struggled with the concept the sapping a barricade (what do you sap, the blinking light?) before Chris =[Ga]= came up with the solution: Barricades are flammable. Like light-it-on-fire-and-it-continues-burning. It's wood. It burns. And it can be repaired while burning. So pyros can light it on fire with their flamethrowers and/or flare gun... and spies, instead of sapping it, toss their cigarette butt onto it.
SPY BURNIN' MAH BARRICADE!