NetBackup 6 changed files detection?

[Ivar3]

Hi,

Can I disable "changed files" control by "archive flag"?
I use in workstations winrollback utility that dont write
file changes to physical disk but only into memory. So, I
cant use archive flag for file changes detection. Can I use
in NetBackup6 other detection methods such file-size or
"file modified time changed"?
Also "newer file" detection algoritm isnt trustable because
changes means also when I overwrite newer file with older one. And also journal check algoritm isnt trustable because
antivirus programs change this journal all the time.