Not as far as I am personally aware of. Pity none of the old guard & devs are not still around. They would investigate new versions of software to check their behaviour was ok & not damaging to the network. et voilà was one of those who would do that. He was probably considered a troll by the ShareAza forums but he had genuine concerns about certain behaviour of certain versions of software as such. et voilà was originally a LW contributor & also one of the original FW devs, as well as being a SM here at GF.

App blocking can be achieved at program level; blacklisted versions for example.