Either I'm doing it wrong(tm) or something, but it is not possible to do the glitch in Beta 5 because the camera completely follows Sonic downward to the bottom of the zone. Doing it in this beta obviously works from what you guys have said.
Sorry to bump this but I have got this to work in BETA5... tails will still jump and mega score plus lives will still rack up even whilst the camera follows sonic on his way down....