Actually Finnster, from all the research I've done, the amount of effort to deploy the flaps does not increase with speed...but it does with g force only because of the effects on the pilot. There is a video on youtube that shows a guy in a 109 (indoors, probably an airshow hangar) turning the flap wheel...if I remember correctly 6 1/2 turns of 45 to 60 degrees each until the flaps were fully deployed at 42 degrees.
The only consideration for 109 flap deployment was structural integrity..."safe speeds" were dictated to prevent pilots from breaking wings by deploying too high of a flap angle higher than safe speeds...but there are pilot accounts showing that the flaps could be deployed at higher speeds in actual combat...of course, those that failed probably never lived to talk about it, and the ones who survived the failures probably weren't going to admit to making the mistakes.