Hi, In a current licensing conversation on the incubator list this issue has just been bought up and states that for source releases there is no need to add to the LICENSE file for any MIT or BSD licences. For binary releases it a little more complex as the ASF provides no guidance for binary release (probably because they are not considered a real release) but it's suggested that they go in the LICENSE or NOTICE file. There is no need to list all of the files.
In the light of this I think it's best to remove the FlexLib MIT and Adobe BSD licence from the source LICENCE file but leave them in LICENSE.bin. Thanks, Justin