Yes, the V-1 & V-2 programs were a complete waste of resources; & yes, the Germans did air-launch V-1s-- which was another waste of resources. Around
$3 billion wartime dollars-- & that was back when a single buck bought you dinner. 50% more money than the Manhattan Project.
...but that said, they could have gotten a lot more out of their V-1 program & cancelled the V-2.
(After all, Hitler himself wasn't impressed with the V-2. He said it was just an artillery shell with a longer range.)
(The only advantages of the V-2 were a minor increase of range & lot more speed. It's payload was only 1000kg. That's roughly the internal bomb load of your average medium bomber. Pathetic. The V-1 carried 850kg, but the range of the V-1 was only 250km @ 400mph for 5100RM apiece. The V-2 gave you 320km @ 3580mph for a mere 100,000RM apiece. What the hell were those Nazis thinking?)
The V-1's 3 big problems were poor accuracy, slow speed
(a late-model Spitfire could run it down), & limited range.
So 1st, you attach relatively small liquid-fueled rocket boosters under the wings
(liquid-fueled only because the solid fuel rocket hadn't been invented yet). If necessary then you reduce the payload.
...and 2d you add a command link link they had with the Hs-293/D TV guided glide-bomb. Now yeah, I know that the Hs-293/D was never used operationally because the military thought the TV gudance system was unreliable, but the tester-- a guy named Dr.-Ing. Herbert Wagner-- thought the equipment was fine & it was his own lack of skill as a bomb aimer that was at fault.
With these 2 changes you now have a missile you can control from an airborne command post like maybe the 2-seat Do-335 A-10. Long loiter time, high speed... Your V-1 gets into the terminal stage of its flight path, you establish radio contact, switch on the rocket boosters, & now it's got longer range & can no longer be intercepted. Properly designed, the flare of the rockets should be visible a long way off, & you use the TV guidance system to home in on a city-sized target.
It isn't a war winner, but it's better than firing off these expensive things to land in a freakin' field somewhere.
[BTW, I agree with JRScott that the V-weapons were ideally suited to carry chemical weapons, of which Germany had the most advanced in the world, & gicven the Nazi level of morality there is no reason in the world for them not to have used 'em. Some things in life just don't make sense. For more on this point see my thread, "What if Germany does beat Russia?"]