Ed,
I understand we are talking about landings.

If flaps increase lift for takeoffs than the same thing applies for landings. The physical aspects of the wing did not change between take off and landing when using flaps. The difference would be in the type of Flap whether the drag is greater or lift is greater. The article that Salty mentions is a really good one as it describes those differences. On these sport airplanes the type of flap we would be using would increase lift unless you could get the aileron to about a 60 degree angle or higher which would cause a huge disruption in the air flow (angle is a guess and the size of the aileron or surface area of the flight control would also effect this). The increase in lift comes about because when you change the shape of the wing on the lower side you increase the area the air has to flow across there by increasing the lift. The degree of movement on the Dragon Lady would not be great enough to cause a disruption of flow either since the movement is only about 5/8" as recommended by the manual. If you did increase the chord you would increase that deflection but would it be enough to have the drag overcome the lift aspect of the flaps? The other option would be to have the ailerons move up there by becoming Spoiler panels and dumping lift very quickly.

Here is a good website that talks about the four types of flaps. The type would be the norm in our day to day life would be the plain flap. While scale modelers would use the different types of flaps used on that particular airplane that they are building. The split flap is used in the manner you describe but all the other ones are describes as increasing lift along with increase in drag but from what I have read the increase in lift overcomes the increase in drag.

http://www.centennialofflight.gov/es...ices/Tech6.htm

John