it's like an offline bounce but there's no real bounce just a straight up export. try to export just one of your tracks (consolidate it if you have a bunch of edits) and do it to see if it will work (choose a place where to send it).
if it works, then just make your mixes utilizing the master and/or a aux buss in rec with it's input set to whatever you're sending the track outputs to (i.e. audio 1-2) use the master either for automated fade or for master buss/channel effects if you're they type to put something on the master (don't bother putting it on the aux/buss master record). export and done.
as far as dither, i'm not sure if you export out as 16 from a 24 bit audio file, that pt will apply dither, they have auto settings that can be enabled/disabled with choice of built-in dither algo's, but that's in 7, and like i said, i don't know if it would apply to export as well.
personally, this is the only method i use with pt, printing in pt allows me to analyze with my ears in the future within pt as well as analyze using visual spectrum and phase tools.
another advantage other than forgoing the possible wonkiness of pt's bounce and it bouncing in real time, is if i print stems along with the mix, i can come back and easily lower the vox stem if that's what someone asks for after they've got the mix, make a radio edit if needed (same for tv, instrumental, etc versions) or make changes i feel need to be made all with simple quick fader moves or muting and printing that mix without having to go back to the track and aux/buss.