Voyager....The material certainly can be much more condensed, maybe focusing on Lucian and several other things, but since JWs appear to place much less emphasis on this teaching than other more central tenets of Watchtower doctrine, I think a booklet would be far more effective focusing on F&DS/607/UN/etc. type issues.
AnnOMaly...Yes! Hislop deserves a thorough debunking as well. I have posted on this subject on the past, and I know there is a book out there as well exposing his errors, but someday it might be worthwhile to post a thread on Hislop.
Narkissos....But I won't be holding my breath to see if they do a better job in presenting their case, much less dispensing with the doctrine.
zagor...I haven't heard the olive-tree theory, but it does not seem improbable. There did not seem to be a rigid format or standard to crucifixion, so local needs obviously dictated in specific situations.
Kenneson....The mark in Ezekiel was indeed a taw, but in paleo-Hebrew characters the letter would have resembled a Greek chi (e.g. X) than a tau. Which is the symbol that the Franciscans use?
PP....However there is a great deal of evidence pertaining to Christianity and the accusation of ass-worship. I mentioned the quote from Tertullian (cf. also Ad Nationes 1.14), but there is also Minucius Felix (Octavius, 9), and earlier writers made the same accusation against Judaism (cf. Tacitus, Historiae 1.5.3-4; Plutarch, Quæstiones Conviviales 4.5; Josephus, Contra Apion 2.7-9). This pagan accusation against Christiantiy however may rest on confusing Jewish and Christian practices and beliefs with those of the Seth or Dionysius cults, and while the graffito could technically represent one of those sects (tho was Dionysius depicted in a similar manner as in the graffito? My impression is that Dionysius was depicted as with an ass, but not as an ass, and was Dionysius crucified?), it seems more likely - considering the rhetoric of the apologists against the ass-worship accusation - that it is a mocking of Christian believer....