Fosse76,
rest assured, I know HOW Fastpass works and why it exists, and like many people, don't see it as particularly broken. My ideas are based on what could be done if WDW ever perceives FP to be fine-tuned or updated.
In regards to your first criticism:
Because that WILL make the lines longer. FastPass is really a line redistribution system. If 250 FPs per hour are issued at one attraction, the 250 people from the previous hour will be displacing 250 people from the current hour and so on. If too many people go beyond their scheduled time, then you've got 300 people in a spot for 250...backing up the FP line AND by consequence the standby line. Since it apparently isn't so abused (I think most people adhere to the window) it really isn't affecting anything. The employees probably keep on eye on that as opposed to making it policy, giving them flexibility.
...I respond with my first post on this (revised) thread: "...if you show up later, you make the line a TAD longer at that point, but as a result, the lines were a TAD shorter all the time you WEREN'T there. It's plausible that people in the standby line would be getting on, more or less, the same time anyway, because if you showed up within your window, everyone else on the standby line before them would've waited those few extra seconds for you to get on, and it would all balance out, as far as attendance totals at the end of the night. I would guess Disney keeps one-hour windows on the fastpass, however, so that they could start adhering to the windows if levels of attendance seem to make it necessary. Of course, if I'M on line, and have to wait while someone with an expires fastpass passes me by, I'm gonna be a little irked, though I'm sure I'll manage without killing anyone. "
In regards to your next few critiques of my ideas, bear in mind that the three numbered quotes of mine are meant to all work in tandem. Not three ideas, one idea with three parts. I'm not saying it would definitely work, but to say it wouldn't work when you're critiquing each item as its own item is like critiquing a kite when it's unassembled: "No, no no, the kite needs to be held together with sticks! And the sticks need to be attached to some kind of fabric or plastic to be a kite! And there needs to be a string attached to the kite! And the kite needs to be attached to a string! Nope, nope, these things will never work."
And as far as your last critique, about how people shouldn't be allowed to get FPs without getting to the parks...I admit, there's a bit of a point there. FPs WILL probably get "sold out" before a lot of people arrive at the park. But my point is if there were a time-window IN-BETWEEN the time windows you can use your FastPass (AND if the time-windows are enforced), then there are only SO many Fastpasses each person can get anyway, which might prevent them from getting sold out. Let's say there needs to be at least 2 hours before the start time of one fastpass and the start time of another Fastpass. That means, if a park is open for 10 hours, the most Fastpasses someone could get would be 5. And that's IF they get lucky enough to get all the times they want, give or take a few minutes to a half-hour here or there. You might get Splace Mountain for 10-11am, but that doesn't mean you'll get a FP for Splash Mountain at 12-1pm, it might not be available until 12:15-1:15pm, and if that keeps going, you might only wind up getting 4 Fastpasses instead of 5. Hell, if I show up at a park right when it opens, I routinely get more than 5 Fastpasses based on the current system.
One caveat would be that some people might get Fastpasses and then not go to those parks. Possible Solution? Getting a Fastpass deducts a day from your Magic Your Way Pass. If you get a Space Mountain Fastpass for 10am, you're automatically tied to going to MK, sticking your ticket in the opening turnstile is basically a formality, but you've already been deducted a day from your MYW pass. And if you don't have Park Hopper, and then change your mind and try to go to a different park, you're shut out. If you DO have Park-Hoppers, you can get into another park, but you're still tied to the FPs you've received. Sure, someone might change their minds and go to Epcot instead, but if they got a 10am Fastpass for Space Mountain, the earliest time window they can get a Fastpass in an Epcot attraction would still be starting at noon, because of the two-hour window. As a result, the people who will take advantage of this system will be people who have every intention of showing up and using it to their advantage. Will mistakes happen? Sure, but mistakes happen now. As others have noted, people keep their Fastpass ticket or toss them if they think the one-hour window is being enforced and they've missed it (me, if I can't use a Fastpass, I give it away).
So if there were kiosks like this throughout WDW's property, the people who would get screwed over the most would be off-property visitors (and really, who cares about THEM?

) But seriously, ladies and germs, considering you can only get a handful of Fastpasses this way, it still means you have to schedule your time appropriately. It doesn't afford you the luxury of getting a FP for every single attraction you want to experience (unless you want to only experience 5). And if they WERE all over the World, even off-property guests can go to a resort or DTD and see what they can get before arriving at the parks, giving them an added opportunity to plan their day around what else they'd like to do (including, yes, eating and shopping).