I think I may need some clarification from you, but I'll try to answer anyway.
When you say "Full Balcony" I assume you mean a large balcony that spans from the living room to the Bedroom. The answer is no, some 1BR's have 2 separate smaller balconies, one off the Living room and one off the bedroom. I have had both and do prefer the one long one. But just in case you didn't mean that, if you're asking if all the rooms have balconies, the answer is yes, all the rooms have balconies.
The way you worded it has me unsure of what you reserved. When you say "preferred BoradWalk view" did you ensure the ressie is for a "Guaranteed Boardwalk View? If the ressie is for a "Preferred View" at BWV it won't be a Boardwalk view.
If it's not a guaranteed Boardwalk view you may or may not see the Epcot Fireworks from you room, depends on your luck. As you say, it can't hurt to ask for what you want, but some things are just not available as requests. I am pretty sure full size balcony and Illuminations view are in that category. Someone will correct me if I am wrong, no doubt!
One bit of advice I learned from these boards that has helped me tremendously:
Don't get too hung up on the view thing, this will be the first of, hopefully, many great trips to WDW and BWV. If the room isn't "perfect" this time, maybe it will be next time, but it can't always be. You'll have a great time no matter what, BWV is a great resort, my kids and I just love it. 88 more days for us!
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