*Apparently if you start in the Forum and make your way towards the Colosseum and show your ticket at the end, you avoid the que. *
That's not really accurate. Your entry ticket is what allows you to avoid the lines. The lines are for those waiting to purchase entry tickets, if you already have them you go in a different line to the security scanners.
You don't need to visit the forum/palatine hill and the colosseum on the same day. You get two consecutive days to visit them with a single admission into each. The forum and palatine hill are considered a single site on your ticket because they are connected by an internal walkway. Once you're inside one you must visit both as you won't be allowed to re-enter either once you leave.
I always suggest buying tickets online at home. You can print full priced tickets at home and not need to bother going to the ticket counters. Some people will suggest getting tickets at the forum entrance but lately the lines there have been building and you could wait 20 minutes or more. With pre-purchased tickets you wont wait at all and will go directly to security.
NO ONE bypasses the security check point. There can be backups getting through security but there is no way to avoid that.
Gee, if your booking is only for entry tickets you can pick them up at either the colosseum or forum entries. If you booked a tour of the colosseum you can only pick up your tickets and check in for your tour at the colosseum.
2) I'm confused. You booked a night tour AND entry tickets? If you just booked a night tour it won't include entry to the forum/palatine hill or colosseum during the day. If you booked both the night tour and regular entry tickets you'll be able to pick up the entry ticket when you check in for the tour. It's a single transaction that cannot be broken up.
The night tour is only a tour of the colosseum underground and regular areas. It does not include entry to the forum/palatine hill or to the colosseum during the day. This requires a separate entry ticket.
Donna