Requiring *all* blocks to be made within a 1/4 second time-frame is something that might actually add considerable depth to the game. There would need to be severe rebalancing done so that an opponent can't simply sit with a chambered sideswing held to your side, though.
A change like this - something that cranks up the learning curve of the game, and potentially adds a large amount of depth to the game - is an example of a good change.
There was (is?) a 50ms 'lag compensation' added for the window of opportunity to block.
I'd prefer to up the ante on wpf (and get a tiny bit more speed) and hope to fake someone out rather then cripple the chance to block, and probably add 1 to weapon speeds across the board as well.
Since BigSandwich (whoever the fuck that guy is now) was a peasant pre-patch I would avoid because he could block like a motherfucker, will have no problems with this proposed adjustment, I say you vote yes to proposal Z and let everyone have the opportunity to piss me off with fabulous blocking.