If you want alpha channel transitions in Wirecast you may want to submit the feature request. They need to know what the users want.
CamTwist has been in beta for the next release for a very long time (a couple of years????).
I think the big problem they face is Apple has moved to AVFoundation (CoreMedia) and Adobe FMLE seems to be EOL with Quicktime. The result would be that the new CamTwist can no longer use FMLE to stream as CamTwist is also moving to CoreMedia as they should.
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